(0.9.2compat) prefer self.func over repo.func in kwrepo Avoid nesting by falling back on parent class member function.

(stable) merge

Eliminate potential reference cycles from kwrepo - delete kwrepo.commitctx after using the tweaked version - prefer self.hook over repo.hook to avoid nesting Also pass arguments to commit as arbitrary list. Thanks to Simon Heimberg and Matt Mackall for guidance.