merge with crew-stable

dispatch: also pass level argument to __import__ for ignored modules I wanted to check if mercurial.demandimport could speed up the loading of PyObjC, and ran into this: the level argument for __import__, available in Python 2.5 and later, is silently dropped when doing an 'import *'. I have no idea what these arguments mean, but this minor change made it work. (Oh, and because of that 'from ... import *', PyObjC still took about 2s...)