defs: Remove some over-engineered functions.
lpf-gui: Add a reset button.
README: update
scripts: lpf-sudo-*: check for metachars in input.
Notify: new semantics and name for hidden/muted packages.

Change ownership of hide files form pkg-build to user. Rename
visible commands from hide to mute. Finalize mute/hide semantics:
a muted package stays muted until unmuted, irrespective of
package state. Use always available /var/tmp instead of LPF_VAR/tmp.
update: Use fixed font in 'update done' dialog.
update: bugfix: handle window delete signal.
TESTING: update