[NOP] coding style improvements
[FEATURE,PARAM,DOC] added option to treat isoleucine/leucine as equivalent ('-IL_equivalent'), updated doc; resolves #872
[TEST] test for 'PeptideIndexer -IL_equivalent'
Merge pull request #928 from cbielow/AMT

[FIX,BUILD] fixes wrong parameter ordering of cmake option command
Merge pull request #927 from hendrikweisser/PeptideIndexer-isobaric

PeptideIndexer: support for treating isoleucine/leucine as equivalent (resolves #872)
TextFile feature (skip empty lines) and docu fix
Merge pull request #929 from cbielow/feat-TextFile

TextFile feature (skip empty lines) and docu fix
AccurateMassSearch improvements