infantry anims: running ticks corrected

I guess nobody noticed, but in CNC and RA, the legs of infantry move way too fast. It should be ~100 Tick. 
construction yard does crane animation slower

when building other buildings, construction yard crane should go slower, at ~100 tick.
added unit explosions for flametank, helis

added unit explosions for flametank, helis and flamethrower e4
changed GrenadierExplode and UnitExplodeSmall a bit
Flame Tank gets FlametankExplode when it dies

Flame Tank gets FlametankExplode when it dies (big explosion that hurts nearby units)
Helicopters do HeliExplode when they die

Helicopters give off a nice explosion before falling to the ground.
added explosion for helicopters crashing on ground
added helicopter explosions; a10 hp boost

Helicopters get explosions, when they fall from the sky, and then when they collide with the ground (and do damage).
A-10 HP raised from a very small 60 to 150.
removed FlamethrowerExplode for now

Removed FlamethrowerExplode for now, until it is certain what the damage stats should be and the probability of exploding.
Merge pull request #2779 from psydev/patch-9

cnc infantry anims running ticks corrected and heli explosions added