Merge branch 'develop' into libs

* develop:
  add easyconfigs for IMB with different toolchains
  remove faulty 'easyblock = ConfigureMake' line from HPL easyconfig
  add easyconfig file for EasyBuild v1.16.1
  fix deprecated fallback to ConfigureMake easyblock in HPL easyconfig
  add easyconfig file for EasyBuild v1.16.0
  add easyconfig for HPL 2.1 with intel/2015a
  add easyconfig file for intel/2015a