streamclone: reimplement nested context manager It's gone in Python 3, and you can't *ctxs into a with statement. Sigh. Differential Revision: https://phab.mercurial-scm.org/D4690

bundle2: grab kwarg using sysstr # skip-blame just an r prefix on a string Differential Revision: https://phab.mercurial-scm.org/D4691

py3: mark another passing test Differential Revision: https://phab.mercurial-scm.org/D4689

bookmarks: remove --active in favor of --list It's weird that we have both --active and --inactive options meaning completely different things. Instead of adding a one-off option, let's document the way to display the active bookmark by using -l/--list. No deprecated option is added since --active isn't released yet.

bookmarks: add explicit option to list bookmarks of the given names This is a generalized form of the --active option. A redundant sorted() call is removed. There was no point to update dict items in lexicographical order.

bookmarks: reject --delete with --inactive which makes no sense A deleted bookmark is neither active nor inactive.

bookmarks: parse out --inactive to action early The --inactive option can't be directly mapped to an action or a modifier. With any names, it means to add/rename to inactive bookmarks. Without names, it means to deactivate the current bookmark. This patch separates them to "inactive" flag and "action == 'inactive'".

bookmarks: parse out implicit "add" action early This prepares for adding -l/--list option, which can be combined with the positional arguments.

bookmarks: clarify that opts['rename'] points to an old bookmark to be renamed

bookmarks: refactor option checking to pick one from --delete/rename/active