Previously, there were three different DTDs used. Let's switch to a single one.
We will go with 4.5, since it is latest version that does not have any backwards incompatible changes.
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day out of date.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
