fix checking for beagle-lib dep (deprecate checking for BEAGLE) for MrBayes
Merge pull request #228 from boegel/fix_bugs

fix checking for beagle-lib dep (deprecate checking for BEAGLE) for MrBayes
bump version to v1.6.xrc1, update release notes
Merge pull request #229 from boegel/v1.6.x

bump version to v1.6.xrc1, update release notes
bump version to v1.6.0
bump version to v1.6.1dev
Add easyblock for libint2