help: use backticks for progress.format keywords, correct letter case

log: help provide sort by date example

log: mention ordering a user complained that hg help log did not hint how to sort the output by date

transaction: remove 'if True:' This seems to be left over from 96dd93de548c (transaction: reorder unlinking .hg/journal and .hg/journal.backupfiles, 2015-10-16).

lazymanifest: check more return values in filtercopy Spotted by Bryan O'Sullivan (and vexingly not the static analyzer I've been using.)

mercurial: pass ui to extensions.load (issue5007) extensions.load does need ui argument to print error if an extension fails to load.

test-patchbomb.t: drop a number of now-redundant uses of "-n"

test-patchbomb.t: test use of sendmail program

merge: add options to warn or ignore on colliding unknown files A 'colliding unknown file' is a file that meets all of the following conditions: - is untracked or ignored on disk - is present in the changeset being merged or updated to - has different contents Previously, we would always abort whenever we saw such files. With this config option we can choose to warn and back the unknown files up instead, or even forgo the warning entirely and silently back the unknown files up. Common use cases for this configuration include a large scale transition of formerly ignored unknown files to tracked files. In some cases the files can be given new names, but in other cases, external "convention over configuration" constraints have determined that the file must retain the same name as before.

batchget: add support for backing up files We're going to use this in an upcoming feature.