Fixed compilation error in G++ 4.6

skew.h:39:51: error: ‘constexpr’ needed for in-class initialization of static data member ‘SIMILAR_SKEW_PERCENTAGE’ of non-integral type

This version should work in both g++ 4.5 and 4.6
Merge branch 'bugfix_gcc46_compilation'
csg: Unused variable removed
ci::block_finished: Indentation fixed
ci::block_finished: Print additional info in DEBUG mode
ci: BUGFIX: There is no confirmed_skew values after different value is computed
Merge branch 'bugfix_confirmed_skew_undefined'