Make synopses more concise in various place, improve
consistency of formatting, and fix some small mistakes
and oversights.
Closes: #2307
Approved by: matthiasclasen
The --verbose and --ostree-verbose options are global to all
subcommands, but --version can only be used with the main "flatpak"
command, so fix the man pages to reflect that.
Updating the appstream data on every invocation of the search command
involves a lot of overhead, so instead only update it if it's at least a
day out of date. This is consistent with how tools like dnf work.
Closes: #1352
Approved by: alexlarsson
The other commands that support --user and --system allow you to specify
an installation using --installation, so this makes search consistent
with that.
Closes: #1185
Approved by: TingPing
