[FIX] fixed bogus problem with MacPorts distributed clang compilers
[DOC] Changing dox base URL for manual.
[INTERNAL] README was renamed to README.rst
[INTERNAL] More README => README.rst renaming.
[INTERNAL] Adding missing LICENSE files.
[DOC] Adding README for seqan_flexbar.
[FIX] Search/Join: prefixed executable names by s4_
Merge branch 'hotfix/fix/searchjoin/target_names' into develop

Conflicts:
	core/tests/stream/test_stream_lexical_cast.h
	manual/source/conf.py
Merge pull request #665 from esiragusa/hotfix/searchjoin/target_names

Apply Search/Join hotfix to develop