Minor fixes suggested by AsciiWolf

Included more screenshots showing alien race units.

Makefile

@@ -138,7 +138,7 @@ endif
 BASEGAME_CFLAGS=-I../../${MOUNT_DIR}
 
 ifndef PREFIX
-PREFIX=/usr
+PREFIX=/usr/local
 endif
 
 ifndef COPYDIR

misc/io.github.grangerhub.Tremulous.appdata.xml

@@ -21,33 +21,83 @@
       Players on both teams are able to build working structures in-game like an
       RTS. 
     </p>
+    <p>
+      The GrangerHub version contains the updated game server and
+      client binaries with several stability improvements and new
+      features. See the GrangerHub Github page for more details:
+      https://github.com/GrangerHub/tremulous/
+    </p>
   </description>
   <url type="homepage">https://github.com/GrangerHub/tremulous</url>
   <screenshots>
     <screenshot type="default">
-      <image type="source" width="1280" height="960">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-7d1b.jpg</image>
+      <image type="source" width="1280" height="960">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-7d1b.jpg</image>
       <caption>Tremulous 1.3 development with shadows</caption>
     </screenshot>
     <screenshot>
-      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-7672.jpg</image>
+      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-7672.jpg</image>
       <caption>Tremulous 1.3 alien dragoon jumping over human player with portal gun</caption>
     </screenshot>
     <screenshot>
-      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-ca9d.jpg</image>
+      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-ca9d.jpg</image>
       <caption>Human shooting alien acid tube with laser gun</caption>
     </screenshot>
     <screenshot>
-      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-7628.jpg</image>
+      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-7628.jpg</image>
       <caption>Human base with medistation and armory</caption>
     </screenshot>
     <screenshot>
-      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-6d22.jpg</image>
+      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-6d22.jpg</image>
       <caption>Human with jetpack</caption>
     </screenshot>
     <screenshot>
-      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/grangerhub-trem1.3-e81b.jpg</image>
+      <image type="source" width="1366" height="768">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-trem1.3-e81b.jpg</image>
       <caption>Human outside in ATCS map</caption>
     </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-granger.jpg</image>
+      <caption>Alien builder unit, granger, in front of its base with two eggs and overmind</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-dretch-base-build-bubbles.jpg</image>
+      <caption>Lowest alien unit, dretch, with red building proximity bubbles in ATCS map base</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1119" height="682">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-upgrades.png</image>
+      <caption>Updated alien evolution targets dialog</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-basilisk-evolve.jpg</image>
+      <caption>Alien evolving into second stage unit, basilisk</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-basilisk-gas.jpg</image>
+      <caption>Alien basilisk releasing poison gas</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-marauder.jpg</image>
+      <caption>Alien third stage unit, marauder</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-marauder.jpg</image>
+      <caption>Alien third stage unit, marauder</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-dragoon.jpg</image>
+      <caption>Alien fourth stage unit, dragoon, during pounce</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-dragoon-front.jpg</image>
+      <caption>Alien dragoon - close up</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-tyrant-front.jpg</image>
+      <caption>Alien final stage unit, tyrant</caption>
+    </screenshot>
+    <screenshot>
+      <image type="source" width="1918" height="1064">https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/screenshots/grangerhub-alien-tyrant-ret-smoke.jpg</image>
+      <caption>Alien tyrant rampaging in human base</caption>
+    </screenshot>
     <screenshot>
       <video>https://raw.githubusercontent.com/GrangerHub/tremulous/master/misc/videos/GrangerPub_Quick_Transit_Match-NewSource~tremulousrussian.mkv</video>
       <caption>Quick match in Transit map. Credit: NewSource/TremulousRussian</caption>