[FEATURE] ProteinProphetAdapter

TPP PeptideProphet and ProteinProphet adapter. This version is working for XTandemAdapter idXML results. TPP/xinteract program will do the PeptideProphet analysis on the peptideID results and TPP/ProteinProphet will do the protein inference. 
Tests are added into the SEARCHENGINES folder.
this is a very important point, can you create an issue in the bugtracker for this? I think we in our lab use xinteract mostly for multiple .pep.xml files and this would be a very important feature for many labs.