hggettext: handle i18nfunctions declaration for docstrings translations

Fix and unify transplant and bookmarks revsets doc registration

revsets: generate predicate help dynamically

help: add topic rewriting hooks They are useful when updating help topics dynamically from extensions.

minirst: ignore comments

help: add "revset" alias for "revsets" help topic

Makefile: var for documentation files

Makefile: remove underscore in var name

revset: add translator comments to i18n strings

gendoc: do not strip 'hg ' from synopsis This was an old left-over from when the synopsis line was used as a header. We now have the command name by itself as the header and the synopsis as a literal block immediately after..

gendoc: support multi-line synopses

gendoc: re-add indentation to global option table The indentation was lost in bdc1cf692447.

test-transplant: test transplanted() revset

backout: add --tool argument for specifying merge tool

help: improve merge-tools topic, describe --tool and clarify details This doesn't make it simpler, but it makes it more correct. With help from erikz, mg and abuehl.