qimport: allow importing URLs

revset: fixed bug where revset returning order was being changed Some revsets were innecesarily turning the subset into a set before iterating over it. This led to returning order changing in some cases.

itersubrepos: move to scmutil to break a direct import cycle

import-checker: handle standard modules with arch in the filename Installations with module names like /usr/lib/python2.7/lib-dynload/bz2.x86_64-linux-gnu.so occurs in the wild. Let's just ignore everything after first '.' when guessing the Python module name.