* [NOD-192] Add method to compute confirmations of a single transaction (#306)
* [NOD-192] Implemented txConfirmations.
* [NOD-192] Renamed acceptedBy -> acceptingBlock and ConfirmationsByHash -> BlockConfirmationsByHash.
* [NOD-194 + NOD-199] Update all JSON-RPC methods to use new methods for computing confirmations + Remove the x1.5 factor when counting confirmations in txgen (#309)
* [NOD-194] Connected JSON-RPC commands with new confirmations logic.
* [NOD-194] Fixed failing tests.
* [NOD-194] Removed x1.5 from isTxMatured.
* [NOD-194] Made isTxMatured panic if it receives nil confirmations.
* [NOD-194] Added isInMempool to RPC methods that require it.
* [NOD-194] Fixed a typo.
* [NOD-194] Made the declaration of isInMempool more clear.
* [NOD-194] Removed some unnecessary complexity from isTxMatured.
* [NOD-193] Update Tx-Index to accomodate correct Confirmations structure (#308)
* [NOD-193] Uploaded BlockID to be uint64 in txIndex and addrIndex.
* [NOD-193] Removed the inclusion of current block transactions to txsAcceptanceData.
* [NOD-193] Implemented writing to the tx index txs with the virtual as the accepting block.
* [NOD-193] Added test for txs accepted by the virtual block.
* [NOD-193] Removed the requirement for subnetwork registry transactions to be accepted.
* [NOD-194] Made in-memory the txsAcceptedByVirtual part of txIndex.
* [NOD-193] Optimized txsAcceptedByVirtual initialization.
* [NOD-193] Fixed weird loop in txsAcceptedByVirtual initialization.
* [NOD-190] Fixed merge errors.
