Replace RPC and deterministic signatures in unit tests with Dogecoin values. While
conventionally I'd use an alternative implementation for these, as RFC 6979
compliant signature generation isn't terribly common, and there's no reason
to suspect we've modified this code, I'm going to assert that it's good enough
to test that the code doesn't provide different values.
Correct BIP32 key headers for Dogecoin, also by repacking the data.
Disabled Bitcoin PoW tests, but left code in place to simplify later merges. These are
replaced by the Dogecoin PoW tests.
Make sure that chainparams and logging is properly initialized. Doing
this for every test may be overkill, but this initialization is so
simple that that does not matter.
This should fix the travis issues.
Split GetNextWorkRequired() into two functions to allow the difficulty calculations to
be tested without requiring a full blockchain.
Add unit tests to cover basic difficulty calculation, plus each of the min/max actual
time, and maximum difficulty target conditions.
