Mercurial 4.8 release

This page consists of 4.8 release which is work in progress.

1. New Features

Command templates (aka formatter templates) are stabilized. See hg help <command> -v for details.
New closehead extension to close arbitrary heads without checking them out.
New config option commands.resolve.mark-check to warn or abort on resolve --mark when files still have conflict markers
New config option commands.resolve.confirm to confirm before performing action when no filename is passed.

New absorb extension to make working changes "absorbed" into relevant changesets.
New fastannotate extension to greatly speed up "annotate" with precomputed cache.
The phabricator extension gets into hgext.

Rebaes gets new --stop flag to stop interrupted rebase without discarding the ongoing changes.
Several performance optimizations on fileset query.
Sort out command help by categories.
Storage extensions such as lfs are now loaded on demand.
Improvements to zsh completions:
- Completing files, shelve and unshelve commands
- Completing merge tools
- Completing added and removed (in addition to changed) files to commit and diff commands
- Numerous updates to flags and descriptions
- Fixes for minor issues and a couple of performance improvements

narrow extension has gone under big backward compatibility changes like introducing new server capabilities, moving narrowspec file to .hg/store/ etc. It's is highly recommened to update both client and server side narrow extension. <More details to be added>
Emails from the patchbomb extension will always be printed as though they are iso-8859-1 if they're not valid us-ascii. Previously, previewed emails were always claimed to be us-ascii and might contain invalid byte sequences.
'hg debugdata' no longer accepts the path to a revlog file.
Bulk-renaming of the formatter template keywords:
- "{abspath}" and "{file}" to "{path}". Any "{path}" is a repository-absolute path. Use "{path|relpath}" to convert it to a filesystem path.
- "{copy}" in status command to "{source}".
- "{oldhashes}" and "{newhashes}" in journal template to "{oldnodes}" and "{newnodes}" respectively.
- "{line_number}" to "{lineno}".
- "{status}" of resolve command to "{mergestatus}".
A repository will no longer use shared storage if it has a ".hg/sharedpath" file but no entry in ".hg/requires" saying it is shared.
This change should not have any end-user impact, as all shared repos should have a ".hg/requires" file indicating this.