Extra information in mutt version string, redux.
Restores [f1b4d1d17200] functionality with a slight change to keep 'make dist' working (see backout in [6b38124a5b81]). Automake is too much voodoo for me at this time, so I let it keep VERSION. mutt.h defined MUTT_VERSION as VERSION and the code used that, so I removed MUTT_VERSION from mutt.h and put it into config.h via configure.ac. A couple of tweaks were needed elsewhere. This restores the fancy-versioning feature within mutt and keeps 'make dist' happy.
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