minor install issues

[mark-summerfield]

I installed following the instructions on this page:
https://libagar.org/docs/inst/linux.html
However, on the page it says run make but when I first ran configure it said to run make .. all (I forget the other word). Anyway, it worked as did make install.

1. So the web page is out of sync with what configure says
2. In agar's install folder at the top-level is an executable file called 'bin'. I think this is an error and it should have been called agar-config or agar-vg-config.