Test Tube Handling improved

For placing/removing chemical fluids in world, if you don't have 8 tubes
available it checks for more stacks of the chemical in your inventory
Minechem Fuels!

With added MT awesomeness
Unfortunately for some reason (I think because test tubes are registered
as fluid containers) it will only burn with ItemStacks of size 1.
Possible workaround: register a FuelItem and then add crafting recipes
for eg 4xElementItem.C -> 1xFuelItem.C
Fixed fuels

huzzah
Merge pull request #366 from hilburn/1.7-update

Test Tube Handling improved AND Minechem Fuel Handling (with MT interface)