blossom trees: indestructible; blue slower

Trees were made destructible; now they are indestructible.
Blue tiberium blossom trees regenerate slower than green tiberium. This keeps the green ones relevant in maps with both kinds of trees.
The blue ones produce at slightly over half speed, and slightly over 2x value, giving them a slight advantage. Blue's total value production rate is ~1.25x faster than green tib. blossom tree. 
applying balance stick

Stealth Tank damage vs. wood nerfed; a few stnks could quickly uncloak and destroy a building, e.g. refinery. 
Guard tower slight buff, to kill E3 in 2 shots instead of 3, and E4/E5 in 4 shots instead of 5.
E3 rockets expire a bit sooner. They would continue on forever. Their range is still long, but now it's possible for some units to escape.
orca rockets -- fewer, more powerful (less spammy)

When you have multiple orca rockets firing at once, the screen fills with missiles and smokey trails. Reduced the number firing per second, but they do the same total damage, so balance remains unchanged.
Will change their trail shortly to something other than smokey.
Next commit will change their ammo load.
orca update; ammo increased 5 -> 6. heli sight++

Orca ammo reduced from 10 to 5, since 
Increased toal ammo from 5 to 6, since orcas seem to be a bit weak vs. tanks, flame tanks, etc.
Apache Helicopter & Orca sight range increased from 8 to 10. Seems good here, I wouldn't increase anymore, or they will be too good at scouting by themselves. Leaving it here requires using other units for their scouting value.
A-10 sight range increased from 8 to 12. This makes the airstrike better for scouting, and seems to make sense for an airplane. Since it's a superpower, won't be too powerful. 
Harvester capacity & unload time changed

The carrying capacity of harvesters was increased from $525 to $700. (This is the original C&C 95 value).
Overall harvesting rates are roughly the same.
To keep overall harvesting rates the same, the amount of time spent unloading at the refinery was increased. 
The purpose of these changes is to:
- make blue tiberium harvesting from distant fields economically feasible by increasing carrying capacity
- make basewalking less necessary in order to take advantage of blue tiberium fields farther away, especially in early game.
- make harvesting from distant tiberium fields less penalizing. If you have more harvesters harvesting tiberium farther away, the unload time won't affect you as much as if you were harvesting closer by.
- make refineries more relevant and make the player build refineries to increase capacity, and not only relying on a fleet of harvesters. (A good idea anyway since Ion cannons can kill refineries, and you should have more than one).
- keep with flavor of C&C, where tiberium was a dangerous substance which had to be carefully unloaded, unlike ore from RA which was immediately dumped.
Mammoth Tank buff; balance stick for MLRS

Mammoth tank buffed, since people said it was too slow and died easily, e.g. dying too readily while approaching enemy through artillery fire.
-HP increased from 600 to 800. Seems justifiable since it's an expensive, slow-to-build, top-tier unit.
-Speed increased from 3 to 4; (C&C 95 default value, incidentally)
-Rotation reduced from 5 to 3 so that it has a flavor of slowness, and a vulnerability.

MLRS speed reduced from 8 to 7, so it's not uncatchable when retreating.
MLRS health reduced from 120 to 115 so Rocket Bike can kill it in 5 shots instead of 6.
MLRS InitialStance set to Defend, to help noobs avoid unintentionally bunching them up (and making them vulnerable to airstrikes, etc.) and to require less micro-management of their positions.
blossom trees fix 

removed -TargetableBuilding and -AutoTargetIgnore
increase nuke damage vs. heavy armor (ATWR)

Nuke damage vs. heavy armor increased, so that it can efficiently take out GDI advanced guard towers.
Guard Tower gun buffed

There were complaints the Guard Tower was too weak. Generally, it's better if CNC is not a game of infantry spam. So it fires more often now. (ROF decreased from 40 to 30)
Its damage was increased from 45 to 50 because Flamethrowers were surviving with 1 HP, which is annoying.
Ion Cannon buffed vs. heavy armor; revamped

Ion Cannon does more damage vs. heavy armor--supposed to be more effective vs. advanced guard towers & Obelisks.
It no longer uses the PerCell damage model because the amount of damage vs. buildings varied wildly. It now uses the standard model and works pretty well.
weap/afld HP reduced; HQ adjustments

Weapons Factory & Nod Airstrip HP reduced greatly (to 1000), so that nuke can now destroy them (& Ion Cannon almost but not quite).
Advanced Communication Center's HP increased from 1000 to 1200, to give it some more breathing room vs. ion cannon strikes.
Added ANYHQ as a custom pre-requisite, so that the temple of nod and advanced communications center will also allow building of advanced units. 
Merge pull request #2891 from psydev/patch-4

blossom trees: indestructible; blue slower