convert: split docstring lists for easier translation

convert: use field list instead of option list in help Use field list instead of option list in convert help, because the option list format used, with defaults and type of argument is not supported by docutils.

doc/Makefile: docs now also depend on extensions After 0d09991f91ee the hg(1) manpage contains a section with help extracted from the extensions, so we should depend on them too.

keyword: function to look up changectx for expansion Similarly rename variable in kwtemplater.overwrite().

localrepo: make heads use the keyword args of the sorted builtin

import: add another line feed to message join string Changeset descriptions are not guaranteed to have a trailing carriage return.

tests: unify test-no-symlinks

patch: remove unused applydiff() sourcefile argument

patch: remove unused gitworkdone variable from iterhunks()

test-import: use printf instead of echo