add check for deprecated automagic fallback to ConfigureMake
add easyblock = 'ConfigureMake' to easyconfigs where it's missing
improve error message on automagic fallback to ConfigureMake
Merge branch 'develop' into deprecated_ConfigureMake_fallback

Conflicts:
	easybuild/easyconfigs/m/MPICH/MPICH-3.0.4-GCC-4.8.1.eb
add easyblock = 'ConfigureMake' to easyconfigs where it's missing (bis)
add easyblock = 'ConfigureMake' to popt easyconfig where it's missing
Merge pull request #1248 from boegel/deprecated_ConfigureMake_fallback

deal with deprecated automagic fallback to ConfigureMake