gnome-screenshot-import: shut up warnings
gnome-screenshot-import: use a better date format
gnome-screenshot-import: add options to set file template, disable flash

This renames the "fullscreen" shortopt to -F, but that's fine because
it's the default anyway, and `gnome-screenshot` does not even have an
option for it.
gnome-screenshot-import: add --(no-)frame, --(no-)flash
gnome-screenshot-import: ~/Pictures is already the default location
gnome-screenshot-import: always output absolute paths
gnome-screenshot-import: let's say File::Spec is more proper or whatever
gnome-screenshot-import: use XDG user-dirs config

...instead of hardcoding Pictures.
rdt: query for ANY instead of three separate types

Reduces query amount by almost 2/3, even if it does result in larger
responses.
rdt: check rrtype explicitly

Maybe ALL wasn't a good idea after all. This filters out NS, MX, and
other irrelevancies.