bookmarks: allow deleting active bookmark using '.'

template: add minimal obsfate template function The goal of this series is to have templates capable of displaying the evolution of a changeset in a clean and human-readable way. Add the succsandmarkers template return successors and markers so it can be used separately like this: > {succsandmarkers % "{get(succsandmarkers, "markers")|json};"} The following patches will add template functions that takes successors and markers as inputs and compute various obsfate fields from them.

obsolete: track markers in _succs We now also store markers in _succs. It will be useful for the obsfate template that will use them to display more meaningful information like the list of users that have evolved a changeset into its successors.

obsolete: add an explicit '_succs.copy()' method Mimic the standard API for copying in the _succs class, it makes the code slightly cleaner and will be needed later for copying markers at the same time than copying the list content.

obsolete: introduce a _succs class It will be useful later when we will be adding markers to _succs in order to represent a successorset with the list of markers from the root to each successors sets. This information will be needed for the obsfate template I will introduce. Makes it a subclass of list so all callers will continue to work.

simplemerge: simplify code now that we always write to a context There's no need for an `out` abstraction between files and contexts anymore. Differential Revision: https://phab.mercurial-scm.org/D383

simplemerge: make context parameters non-optional Also update the function docstring. Differential Revision: https://phab.mercurial-scm.org/D382