Inform about single pcm mode for now.
We still need to pass the headers -> pcm mapping to the module manager, thus replace the module name by allDict for single pcm, and "load" the pcm.
Survive declareModuleMap() calls with headers == NULL (as for the single pcm case).
Now we have duplicate definitions coming from the dynamic lookup includes and (presumably) the PCM...


git-svn-id: https://root.cern.ch/svn/root/trunk@48656 27541ba8-7e3a-0410-8455-c3a389f83636