support for hierarchical module naming schemes

@geimer: this should fix the problem that's blocking you right now

I might need to figure out one more thing w.r.t. the devel module name before this really works for you, I'm looking into that...
changed this to reporting the error with only the module name under the active scheme (rather than including all the nasty details), and also including warning log messages with the detailed dictionary and EasyBuild module names)