Further cleanup of ui.py (changeset 74d569332f8b used one-char variable names).

packagescan can't scan nested packages

move purge extension out of hgext. it is not as clean as other modules in hgext. can move back after rewrite.

import: allow to import stdin with file name "-"

fix comment.

merge with crew.

merge change to ssh protocol.

refactor ssh server.

remove appendfile for the manifest when adding a changegroup Since the changelog is using appendfile, the manifest entries cannot be referenced, so we don't need to use append file for the manifest.

hgweb: fix errors and warnings found by pychecker - fix missing import - use type_ instead of type - remove unused variable