threat: don't hide the element in Enable
altpowerbar: Change HasScript to GetScript

Change HasScript to GetScript to provide the intended functionality  for displaying the alt power bar's tooltip.
Merge pull request #205 from Rainrider/threat

Threat: don't hide element in Enable
power: UNUSED is now called CHI
Merge pull request #208 from Rainrider/power

power: UNUSED is now called CHI
stagger: add monk's stagger bar
altpowerbar: fixed visibility.

Always show on player.
Show on other units if showOnRaid is true or hideFromOthers is false.
stagger: minor optimization.
stagger: update on UNIT_AURA instead of using an OnUpdate script.
Merge branches 'altpower-fixes' and 'stagger'