Implement the OPLS2015 parameter generation with FFLD and with Ligpargen

[hteran]

Original QligFEP distribution has opls2Q.py script that calls Schrödinger FFLD and translates the parameters generated.
One needs to define the SCHROD_DIR, which you did in the settings of the original Qligfep distro. In addition it seems that you have to change the relative imports such as from .IO import replace to direct imports such as from QligFEP.IO import replace. The reason for this is that python packages should have the from .module import this_function format. We would need to implement some class function that does the work (like the module already has) and write the argument handling part in qparams_cli.py, for example.

Ligpargen parameterization could be also implemented, for this BOSS5.1 and ligpargen should be instaled, check on Pymemdyn for details.

[David-Araripe]

Thanks @hteran, I'll add this to the TODO list so it's tackled at some point. I also added some changes according to your feedback on the tutorials. Please add to the issues if you come across errors again but I hope things are a bit clearer now: