[FIX] IDPep: remove unused output files, better naming; gnuplot script now writes PDF instead of PS (better platform support); fixed some bugs which lead to SegFault when q-values are provided (from FDR upstream)
fixed gcc compile errors
fixed 'out_plot' from required to optional'
[FIX] suppress plots when not requested
added a comment
added missing include
Merge pull request #726 from cbielow/IDPEP++

IDPosteriorErrorProbability fixes