Change Green Sapphire to Peridot to match current versions of Project Red mod
Leave Railcraft saltpeter out of COG for now, fix dark gem substitution

Make vanilla gen of RC saltpeter the default
Do not substitute for RC saltpeter
Include best attempt at COG saltpeter spawner, but commented out because induces stack overflow
Fix substitution of Dark Diamond, Emerald, Lapis to use stone, not abyssal stone
Also allow COG gen of Saltpeter, with Substitution, will not respawn
Change name of amber veins distribution to reflect proper biome type
Fix copper and tin enhanced distribution, add TC prefix to all variables etc.

Copper is enhanced in jungles, not frozen
Add TC prefix to all names
Fix Tin motherlode dependency on copper mystcraft symbol in veins and clouds
New Galacticraft distribution file

Aluminum, Tin, Copper all use similar distributions to other mods with those ores
Silicon is treated "as rare as diamond" per the mod
Silicon pipe veins reach up from bedrock with similar frequency as diamond.
The pipes are filled with sand, not lava, however.
TE Nickel -> Ferrous Ore
Merge pull request #23 from agilmore2/master

Mod config fixes, including new Galacticraft configuration file