gpg: treat "ERRSIG" as a valid key id but no fingerprint

commit: enable --secret option At the moment, creating secret commits is slightly cumbersome. They can either be created by changing the default commit phase to secret or by doing `hg phase --secret --force`. Both of these make secret commits appear to be like some kind of advanced feature. Secret commits, however, should be a convenient feature for people who want to work on a private branch without affecting anyone else. There should therefore be a prominent and convenient method for creating secret commits. Since the default phase is draft and there is no need to use --force to go from a secret phase to any other phase, this patch intentionally does not add --draft and --public options.

merge: deprecate the --force option The --force option in merge does not make what people think it does so it may not be visible to everyone. I have local changes and want to pull one's changes which made 2 heads. The --force option in help says -f --force force a merge with outstanding changes so I can expect that I can use it to force the merge and commit it in my local repository without taking my local changes into account. But merging with -f keeps local changes and "add" them: they must be committed or reverted before doing the merge commit. The merge -f cannot be reverted so it leads my repository in a bad state: cannot commit merge and don't want to revert/commit local changes yet. Message in help have been updated to emphasize the fact that local changes are included in the merge.