v0.31.0

@algmyr

jj is a Git-compatible version control system that is both simple and powerful. See
the installation instructions to get started.

Revset expressions like hidden_id | description(x) now search the specified
hidden revision and its ancestors as well
as all visible revisions.
Commit templates no longer normalize description by appending final newline
character. Use description.trim_end() ++ "\n" if needed.

The git.push-bookmark-prefix setting is deprecated in favor of
templates.git_push_bookmark, which supports templating. The old setting can
be expressed in template as "<prefix>" ++ change_id.short().

New change_id(prefix)/commit_id(prefix) revset functions to explicitly
query commits by change/commit ID prefix.
The parents() and children() revset functions now accept an optional
depth argument. For instance, parents(x, 3) is equivalent to x---, and
children(x, 3) is equivalent to x+++.
jj evolog can now follow changes from multiple revisions such as divergent
revisions.
jj diff now accepts -T/--template option to customize summary output.
Log node templates are now specified in toml rather than hardcoded.
Templates now support json(x) function to serialize values in JSON format.
The ANSI 256-color palette can be used when configuring colors. For example,
colors."diff removed token" = { bg = "ansi-color-52", underline = false }
will apply a dark red background on removed words in diffs.

jj file annotate can now process files at a hidden revision.
jj op log --op-diff no longer fails at displaying "reconcile divergent
operations." #4465
jj util gc --expire=now now passes the corresponding flag to git gc.
change_id/commit_id.shortest() template functions now take conflicting
bookmark and tag names into account.
#2416
Fixed lockfile issue on stale file handles observed with NFS.

aarch64-windows builds (release binaries and main snapshots) are now provided.

Thanks to the people who made this release happen!

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