hgweb: refactor multirequest to be a dict of lists
... instead of a list of 2-tuples.
This makes key lookups faster. The only downside is we lose total
ordering of all entries. But we weren't relying on that before, so
it's no loss.
Differential Revision: https://phab.mercurial-scm.org/D2881
#require execbit
$ hg init repo
$ cd repo
$ echo foo > foo
$ chmod 644 foo
$ hg ci -qAm '644'
$ chmod 755 foo
$ hg ci -qAm '755'
reverting to rev 0
$ hg revert -a -r 0
reverting foo
$ hg st
M foo
$ hg diff --git
diff --git a/foo b/foo
old mode 100755
new mode 100644
$ cd ..