docs: remove mention of docs, we do docs elsewhere now
docs: cPO merging is mostly done

While there are still bugs in cPO there are better ways to track this.
It is too expensive in terms of time to review and port any issues to
bugzilla so not bothering to port any of these. We'll do them when we
find them and find the time to fix them.
docs: track filter TODOs in bugzilla

Not bothering to port these to bugzilla.  They'll come up again if they
are important enough.
docs: see --timestamp
docs: we already insert proper Gettext PO header
docs: pretty sure this is fixed for OOo
docs: lets use bugzilla for these

Won't port them across either.
docs: covered in docs/developers/testing.rst
pocount: use mutually exclusive group for argparse
pocount: use argparse to handle --incomplete
pocount: use argparse to select the chosen style
docs: make doc options match --help
Identify the index by identity rather than __eq__
Fix off-by-one

This was giving an index beyond the length of `before`.
Correctly insert at an existing parent if appropriate

At the end of a string (Case 2) the undo of a deletion of a placeable
(e.g. an XML tag) would be restored as plain text instead of part of
the existing tag.
Revert "Correctly insert at an existing parent if appropriate"

This reverts commit bb04ce073bfd5e1543285074b20fedf54d3f6feb.

Tests are failing because of this change. Nothing seems wrong with the
change but it needs a fix to the related tests before it lands again.
docs: add ref for intersphinx links
roundtrip: run silently when roundtripping
dtd: underscore is valid in entity names

We where failing is_valid_accesskey when entity name contained _ which
would remove a leading & and make the entity invalid.
dtd: optional expected makes cleaner roundtrip setups