Setup magic functions for edm utilties

[vkuznet]

I need to add a hook to add into magic functions a list of CMSSW utitilies, e.g. edmDump, etc. when user switch from one release to another. The hook should keep track of them, and discard old ones. Can be done via internal dict.

[vkuznet]

I can make a nice trick, add magic function call into cmsrel. By the time user invokes cmsrel all magic functions will be in place.