Fix a few package-related bugs & implement UNINTERN and PACKAGE-SHORTEST-NAME.
Fix a few package-related bugs & implement UNINTERN and PACKAGE-SHORTEST-NAME.

AugustusHuang/Mezzano,varjagg/Mezzano,froggey/Mezzano,AugustusHuang/Mezzano,rvedam/Mezzano,varjagg/Mezzano,rvedam/Mezzano,froggey/Mezzano