Introduce "ForkInEffect" function and set parameters.

Use a function to query for fork status rather than plain constants.
Use that to set fork heights for testnet at 190,000 / 200,000 for poison
disaster and carrying-capacity, respectively.  Also fix the
carrying-capacity mainnet height at 500,000.

Change carrying limit to 50/25 instead of 100/50.
Bump version to 1.1.0.
Merge pull request #94 from domob1812/set-fork

Update parameters for fork.