* Update the untracked cache subsystem and change its primary UI from

"git update-index" to "git config".

* There were a few "now I am doing this thing" progress messages in

the TCP connection code that can be triggered by setting a verbose

option internally in the code, but "git fetch -v" and friends never

passed the verbose option down to that codepath.

* Clean/smudge filters defined in a configuration file of lower

precedence can now be overridden to be a pass-through no-op by

setting the variable to an empty string.

* A new "<branch>^{/!-<pattern>}" notation can be used to name a

commit that is reachable from <branch> that does not match the

given <pattern>.

* "git worktree" had a broken code that attempted to auto-fix

possible inconsistency that results from end-users moving a

worktree to different places without telling Git (the original

repository needs to maintain backpointers to its worktrees, but

"mv" run by end-users who are not familiar with that fact will

obviously not adjust them), which actually made things worse

when triggered.

(merge 618244e nd/do-not-move-worktree-manually later to maint).

* The low-level merge machinery has been taught to use CRLF line

termination when inserting conflict markers to merged contents that

are themselves CRLF line-terminated.

(merge 15980de js/xmerge-marker-eol later to maint).

* "git push --force-with-lease" has been taught to report if the push

needed to force (or fast-forwarded).

(merge b2e93f8 aw/push-force-with-lease-reporting later to maint).

* The emulated "yes" command used in our test scripts has been

tweaked not to spend too much time generating unnecessary output

that is not used, to help those who test on Windows where it would

not stop until it fills the pipe buffer due to lack of SIGPIPE.

(merge 6129c93 js/test-lib-windows-emulated-yes later to maint).