[INTERNAL] removes Thermo bug zeros from profile data
[INTERNAL] variables renamed
[INTERNAL] reserve memory for vector
[INTERNAL] case of very few data points now covered
[INTERNAL] SplineSpectrum requires three or more data points
[TEST] exception test added
[TEST] exception test modified
[INTERNAL] replaces unsigned by size_t
[INTERNAL] scaling factor for Thermo bug
[DOC] documentation of "slim" variables
[INTERNAL] const for scaling factor
Merge pull request #1070 from lars20070/fix/SplineSpectrum

removing zeros in profile data caused by Thermo bug