client: add pymodis, sentinelsat and pandas libraries

[landam]

Reason GRASS module: i.sentinel + i.modis

[landam]

sudo apt install python-pandas
sudo pip install pymodis sentinelsat

[landam]

Install also on server/master...

python-pip python-gdal required...

[landam]

See also #521

[landam]

TODO: add python-future

[landam]

BTW, installing pymodis fails on bionic due to

Building wheels for collected packages: pymodis
  Running setup.py bdist_wheel for pymodis ... error
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-LM6hV5/pymodis/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/tmpNHMnxzpip-wheel- --python-tag cp27:
  usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
     or: -c --help [cmd1 cmd2 ...]
     or: -c --help-commands
     or: -c cmd --help
  
  error: invalid command 'bdist_wheel'
  
  ----------------------------------------
  Failed building wheel for pymodis
  Running setup.py clean for pymodis
Failed to build pymodis