context: add method to return all bookmarks pointing to a node

contrib: add win32/buildlocal.bat

Make sure bundlerepo doesn't leak temp files (issue2491) Add empty repository.close() and call it in dispatch. Remove bundlerepository.__del__(), merging it into bundlerepository.close(), which overrides repository.close(). http://docs.python.org/reference/datamodel.html says: "It is not guaranteed that __del__() methods are called for objects that still exist when the interpreter exits."