bump version to v1.12.1dev
bump version to v1.12.1, update release notes
Merge pull request #403 from boegel/v1.12.x

bump version to v1.12.1, update release notes
Merge pull request #404 from hpcugent/v1.12.x

EasyBuild v1.12.1
Merge branch 'master' into develop

Conflicts:
	easybuild/easyblocks/__init__.py