VPLG version 2015_09_17 released

I have just released version 2015_09_17 of VPLG.

Changes include:
- support for ligand-centered complex graphs, which show all chains a ligand is in contact with
- fix and dramatically improve the code that draws Ramachandran plots.
- Support for marking prefered dihedral angle areas for different SSE types in Ramachandran plots.
- improve formating of font on images
- fix various small bugs

Note that I also upload release binaries to GitHub now. So you can download the release here at SourceForge, or at GitHub (where dev takes place): https://github.com/dfsp-spirit/vplg/releases