cleanup
moved suffix tree algorithms in the right place
fixed compiler based compile flags + sse4.2 detection
added H_k calculation to examples
fixed int_vector formatting from old astyle
fixed cst.isa () lookup
Merge branch 'general-housekeeping-and-cleanup' of git://github.com/mpetri/sdsl-lite into mpetri-general-housekeeping-and-cleanup

Conflicts:
	include/sdsl/suffix_trees.hpp