enable unity build on OpenMS lib (this required some fixes for unclean variable names and solution for ambiguous classes (std::set vs seqan::set), compilation time on Windows is reduced to <10% (5min vs 45min) on Ultrabook
fix attempt by omitting offending include
merge develop
fixes for linux and VS2013
unity build for GUI
fixed some overoptimizations which prevent compilation in non-unity mode
Merge pull request #756 from cbielow/unityBuild

[FEATURE,BUILD] Support unity builds in OpenMS to increase win compile performance