[FIX] fixed mzid searchdatabase read/write
[FIX] fixed SpectraData write for mzid with MetaValue spectra_data -
this will be empty if read from idxml (not captured there at all, yuk!)
then set to UNKNOWN in mzid
[FIX] fixed SpectrumID write for mzid with MetaValue spectrum_reference
-
this will be empty if read from idxml (not captured there at all, yuk!)
then set to MZ:...@RT:... in mzid
Merge branch 'feature/MZID' of https://github.com/mwalzer/OpenMS into feature/MZID

Conflicts:
	src/openms/source/FORMAT/HANDLERS/MzIdentMLHandler.cpp