added scan-polarity filter to FileFilter; RangeUtils speed improvement by 24% via XOR; minor fixes
Merge pull request #896 from cbielow/lipids

[FEATURE] added scan-polarity filter to FileFilter
(feature for Windows developers) added a small Windows .reg file, which allows to change file extensions on Windows to another OpenMS instance
[DOC] some minor documentation addition
Merge pull request #897 from cbielow/develop

(feature for Windows developers) added a small Windows .reg file
Merge pull request #899 from timosachsenberg/fix/ModificationsDB_doc

[DOC] some minor documentation addition
[FIX] fix MS level for DTA file reader

fixes #893
[FIX] fix test
Merge pull request #901 from OpenMS/feature/fix893

[FIX] fix MS level for DTA file reader
Merge remote-tracking branch 'upstream/develop' into feature/MultiplexClustering2