Sometimes users would get confused because an option they were looking
for was not mentioned on a subcommand's man page, and they had not
noticed that the main git-annex man page had a list of common options.
This change lets each subcommand mention the common options, similarly
to how the matching options are handled.
This commit was sponsored by Svenne Krap on Patreon.
Chose to make this only handle files actively being downloaded, not temp
files for downloads that were interrupted or files that have been fully
downloaded.
This commit was sponsored by Ole-Morten Duesund on Patreon.
