WowAce

Shefki:
    - BetterStatusBar was not clamping the extra value properly.
    When both the value and the extra value was 1 then we wouldn't clamp the
    extra value before setting it because 1 - extraValue resulted in 0 and
    we'd clamp between 1e-5 and 0./
    - Fix Ticket #728: Error in BetterStatusBar
    BetterStatusBar didn't deal with NaN being passed to it, e.g.
    StatusBar:SetValue(0/0).  It now treats this as zero.
    - Fix Ticket #726: PetHeaders being used on non-pet based groups.
    If you copy a group that was setup to use the pet header (Leave gaps for
    pets) then this setting would be copied and applied to non-pet groups.
    So if you copied a pet group and tried to make a raid then only raid
    members with pets would be shown.
    - Fix Ticket #549: Target highlights not always working.
    This module had a number of logic problems with it.  It had a mix of
    multiple design patterns that we use in PB4 modules.  Some parts of it
    assumed that the highlight was only on the frame when it was shown and
    some parts tried to hide and show the frame.
    
    Includes a slight optomization, as the color for the highlight is now
    only set on frame creation and the configuration code nows finds all the
    highlight frames and changes their colors when the config changes.
    
    The standard method of operation now for this module is to leave the
    Highlight frame in existance unless the module is disabled for the
    layout or the frame is entirely torn down.  The frame will be made on
    demand when it is first needed.
    - Allow for fader modules to have priorities less than the default.
    - Ticket #719: Add a priority system to the fader module system.
    Fader modules can now return an optional priority parameter as the 2nd
    return from their GetOpacity function.  If no priority is returned then
    it will be treated as priority 0.  The lowest opacity of the highest
    priority module will be used.  This allows modules to be written to
    force the opacity to be higher instead of simply lower.
    - Just call the Focus frame Focus in LuaTexts like the rest of PB4.
    We were using Focus-target as DogTags was using.  But this is terribly
    confusing when there is a Focus' target frame.
    - Convert the mouseover handling for LuaTexts to events.
    This is far more efficient since it's not updating on a polling basis.
    - Fix the show overheal option for the VisualHeal module.  It was always
    using the setting for the currently selected layout in the config section
    regardless of the layout for the frame.
    - Avoid an error in showing the FocusFrame since blizzard removed
    FocusFrame_Update()