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nodemap: update the index with the newly written data (when appropriate)

If we are to use mmap to read the nodemap data, and if the python code is
responsible for the IO, we need to refresh the mmap after each write and provide
it back to the index.

We start this dance without the mmap first.

Differential Revision: https://phab.mercurial-scm.org/D7893

== New Features ==

 * `hg purge`/`hg clean` can now delete ignored files instead of
   untracked files, with the new -i flag.

== New Experimental Features ==


== Bug Fixes  ==


== Backwards Compatibility Changes ==


== Internal API Changes ==

 * The deprecated `ui.progress()` has now been deleted. Please use
   `ui.makeprogress()` instead.

 * `hg.merge()` has lost its `abort` argument. Please call
   `hg.abortmerge()` directly instead.

 * The `*others` argument of `cmdutil.check_incompatible_arguments()`
   changed from being varargs argument to being a single collection.