bookmarks: drop deprecated methods (API)
The ProgrammingError prevents accidental usage of the dict base class methods.
.. api::
The following deprecated methods have been removed from bookmarks:
__setitem__(), __delitem__(), update(), and recordchange(). Use
bookmarks.applychanges() instead.
changeset: {node}
revision: {rev}
user: {author}
date: {date|rfc822date}
summary: {desc}
{branches%branchname}{tags%tagname}{bookmarks%bookmarkname}