bundle2: move processpart stream maintenance into part iterator The processpart function also did some stream maintenance, so let's move it to the part iterator as well, as part of moving all part iteration logic into the class. There is one place processpart is called outside of the normal loop, so we manually handle the seek there. The now-empty try/finally will be removed in a later patch, for ease of review. Differential Revision: https://phab.mercurial-scm.org/D706

merge with stable

py3: convert system strings to bytes in doctest of formatter.py

py3: rewrite stdout hack of doctest by using ui.pushbuffer() We can't use pycompat.stdout here because the doctest runner replaces sys.stdout with a string buffer.

py3: use bytes os.sep in doctest of pathutil.py

py3: fix doctests in patch.py to be compatible with Python 3 We were lucky that parsepatch() could concatenate a character slice as if it were a list of chunks.

py3: stop using bytes[n] in patch.py

error: move patch.PatchError so it can easily implement __bytes__ (API)