Remove useless includes
Remove unused param from UserCmdGetContract
Merge pull request #277 from mhamrle/small_improvements

Small improvements
MintLucre: remove commented out code
MintLucre: cleanup #ifdef statements
MintLucre: move SetMonitor() code to caller

SetMonitor() is a Windows only helper function but not easily
recognizable as such. Moreover, it uses the same name as
functions provided by the lucre library which is confusing.
Both problems are addressed by this patch.
Merge pull request #280 from toxeus/cleanupMintLucre

MintLucre: some cleanup
opentxs-core: remove unused functions
Merge pull request #281 from toxeus/removeUnusedFunctions

opentxs-core: remove unused functions
Removed unused OTPayload::GetEnvelope, GetMessagePayload, ReadBytesFrom.

blub
Refactored OTData::Release() (does not need to be virtual).
Removed SetPayloadSize (it's the same as SetSize).
Removed GetPayloadPointer (it's the same as GetPointer).
Removed rest of unused OTPayload members.
Removed class OTPayload.