Fixed some bugs found during the preview games
Hopefully implemented scoring staff kills
Started improving animation engine [some spells temporarily broken]
Stopped using primary=false, auto_vflip=false

This reflected my false belief that primary=true would apply all image mods,
  not just the ones for poison and slow.
This should fix poison and slow not showing up, units not shown partially
  in water...
Restored CoF and Energy Blast animations
Worked around a wesnoth bug(?) with ~BG()
Graphics restructuring, and restored primary=false,auto_vflip=false; I was wrong before.

This should also make poison and slow show up properly.
Fixed some Haste graphics errors
Made a rudimentary "parallel attacks" thing and applied it to Fireball
Much improved parallel-attack animations.
Gave Fireball its cool animation.
Improved notes about restrictions on hat rewards