update: clarify that -C and -c are mutually exclusive
This makes it clear in both the synopsis and in the verbose output
that -C and -c are mutually exclusive. It also restructures the
verbose output a little so it's better prepared for a third option
(--merge).
This patch also reorders the options to match the flag table.
update: move check for dirty wdir into hg.updatetotally()
The function has a "check" parameter that's currently unused, and it
makes sense to me to have it honor it. That way other callers than
commands.update() could set it if they needed.
destutil: remove duplicate check and leave it to merge.update()
The check is done in merge.update() already and the next few patches
will add more checks there. Some of the additional checks will need
information about the merge that will not be available in destutil.
Since commands.postincoming() catches UpdateAbort(), we need to change
merge.update() to raise that more specific exception.
This goes directly again
45b86dbabbda (destupdate: move the check
related to the "clean" logic in the function, 2015-10-05), but it will
simplify the next few patches, and we can always move it out again
(preferably move, not copy) after if we still think it's better that
way.