bump version to v1.14.1dev
also include libgomp.a in list of libraries for multithreading for GCC
fix toolchain unit test w.r.t. including -lgomp
Merge pull request #989 from boegel/fix_libmt_gcc

also include libgomp.a in list of libraries for multithreading for GCC
Merge branch 'v1.14.x' into develop

Conflicts:
	easybuild/tools/version.py
Merge branch 'develop' of github.com:hpcugent/easybuild-framework into develop