Note that --from foo --to bar is still not allowed by the option parser.
The goal of this change is only to support the same action over a group
of remotes, not multiple different actions. For the same reason
--to here --to foo is not allowed, since that's really two different
actions.
Each file is processed for all listed remotes in turn, so this is not
the same as two git-annex commands run in sequence. Instead, it allows
concurrent actions to several remotes.
Only move and transferkey converted so far. The code in Command.Move is
ugly and needs to be refactored and generalized.
Build fails due to unconverted modules.
This commit was sponsored by Fernando Jimenez on Patreon.
31ed034f69