transitive copy/rename
Add support for transitive copy or rename operations, e.g.
hg rename a b
... (possibly edit b)
hg rename b c
hg commit ...
by actually renaming "b" as "c" while recording a copy of
"a" to "c" and a removal of "a".
requesting all changes
abort: error: Connection refused
255
ls: copy: No such file or directory
requesting all changes
abort: HTTP Error 404: File not found
255