editor: add a small changectx cache Reverts including a lot of files create many actions like: R bar (from trunk/bar:4343) For each of these files, an open_file() call is made and the parent mercurial revision is loaded to detect copies in issamefile(). This results in a big slowdown, easily reduced by caching the changectx.

include Makefile hgsubversion/help/*.rst
recursive-include tests *.py *.sh *.svndump *.txt