zsh_completion: update all options It's just too hard to further split this patch. What it does: - adds missing flags - removes flags that are no longer there - updates flag descriptions and argument names - adds * where using the same option many times is okay - groups with () mutually exclusive flags that can't be used together - adds + and = to options that need arguments - removes + and = from options that don't take any arguments - fixes minor issues and a typo Differential Revision: https://phab.mercurial-scm.org/D4267

zsh_completion: run hg with HGPLAINEXCEPT=alias to list commands This is what contrib/bash_completion does, looks like a sensible thing to do. Differential Revision: https://phab.mercurial-scm.org/D4266

zsh_completion: remove completion for obsolete graphlog extension Differential Revision: https://phab.mercurial-scm.org/D4265