Rename 1150-psi-nix-systemwatch-over-upower-service.diff to 1150-psi-nix-systemwatch.diff
Add provisional systemd support to UnixSystemWatch

UPower's sleep/resume signals are deprecated, so listen additionally
to systemd's logind.

Todo:
  - Check which service we should actually listen to
  - Use delaying Inhibitor locks for systemd
Merge pull request #15 from FlorianFieber/unixsystemwatch

Add provisional systemd support to UnixSystemWatch