svnremoterepo: use and prefer default-push The svnremoterepo class can be constructed without passing it an explicit class. In this case, it previously only considered the default path as the default path to look at. This broke hg svn info when default-push is set to a svn repo but default is not. Chnange it to prefer default-push when available.

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