[FIX] fixed macosx version query

 * QSysInfo::MV_10_9 is not available in older Qt versions, which leads to a compile error for Qt < 4.8.6
Merge pull request #873 from aiche/fix/macosx-qsysinfo-fix

[FIX] fixed macosx version query
[DOC] added new doc_class_only target that builds only the class documentation
adds doc_class_only to the targets messages (incl. cleanups of the targets messages)
Merge pull request #876 from aiche/doc/class_only_target

[DOC] added new doc_class_only target
[TEST] added SuperHirn library to style tests (addendum to #764)
[TEST] added full path to style test names

 * e.g., FeatureFinderCentroided.cpp_cpplint_test -> src/topp/FeatureFinderCentroided.cpp_cpplint_test
[BUILD,TEST] added coding-style test to travis
[TEST,CI] disabled building when doing style tests (reduces runtime)
[TEST,CI] install missing cppcheck on travis-ci machines
[TEST,CI] fake 0 build errors for style testing
[NOP,STYLE] semi-automatic run of uncrustify on all files raising a cpplint error
[NOP] fixes a cpplint/cppcheck errors
[BUILD,TEST] ignore MSNumpress.cpp in cppcheck, cpplint tests
[FIX] cppcheck fixes
Merge pull request #2 from timosachsenberg/feature/coding-style-improvements

[FIX] cppcheck fixes contributed by timosachsenberg
[TEST] enable cppcheck performance tests
[BUILD] use self compiled cppcheck instead of old system version
[NOP] removed unused QcMLHandler.cpp
[NOP] removed unused SequestAdapter.cpp