[FIX] fix for bug in 'AASequence::operator<' involving N-terminal modifications (fixes #1068)
[TEST] added test case covering bug #1068
[TEST] added test case for 'AASequence::operator<' with C-terminal modifications
Merge pull request #1069 from hendrikweisser/fix-aaseq-less

Fix and test for issue #1068 (bug in "AASequence::operator<" involving N-terminal modifications)