This affects both the BlockChain/GetBlockHeaderReply and the
BlockChain/GetBlockVerboseReply calls.
The field with id 75 was confusingly called 'bits', but this is really
the blocktarget from the blockheaders. We renamed this.
This field is a int-encoded-floating point value and as such it makes no
sense to send it as a simple int. It is now a byte-array.
Notice that the documentation always listed it as a byte-array so we
actually fixed the implementation to follow the spec.
These are technically static libs, but not in any way shared libs.
They are used solely only by this repo and really only by the hub.
Most important, no header files are installed and basically none of
the normal rules for reusable libraries are applied to these files.
tomFlowee