localrepo: reinstate localrepo.parents with a deprecation warning
The function was dropped in
3fe8cb40c9c5. This API drop brokes three of my
extensions including some critical to my workflow like tortoisehg. Lets mark
this API for death and give people time to fix their code.
bookmark: deprecate 'bmstore.write' method
This function does not collaborate with the transaction and must disappear. As
we have likely a lot of third party users, we make it deprecated to let them some
time to upgrade their code.
Thanks goes to Laurent Charignon for cleanup the last remains of the 'write'
method.