* [DEV-348] Removed a couple of unused methods.
* [DEV-348] Implemented validating incoming transactions for bad partial transactions.
* [DEV-348] Added a (incomplete) filter for propogation of transactions.
* [DEV-348] Implemented filtering inventory by subnetwork.
* [DEV-348] Fixed broken tests.
* [DEV-348] Added test for non-zero payload partial transactions.
* [DEV-348] Added a comment for Config.SubnetworkID.
* [DEV-348] Fixed formatting.
* [DEV-348] Renamed isRemoteTransactionFull to shouldTxBeFull.
* [DEV-348] Added a check for invalid transaction in maybeAcceptTransaction. Added handling for native networks.
* [DEV-348] Fixed formatting.
* [DEV-348] Fixed a bug in transaction validation.
* [DEV-348] Rephrased a comment.
* [DEV-348] Extracted subnetwork compatibility to a method. Wrote a test for it.
* [DEV-348] Removed an unnecessary check over the native subnetwork.
* [DEV-234] add TxAcceptedInBlock and TxBlocks
* [DEV-234] test TxAcceptedInBlock and TxBlocks
* [DEV-234] test TxAcceptedInBlock and TxFirstBlockRegion
* [DEV-234] rename selectedPathSet to selectedPathChain
* [DEV-234] set indexers db as part of index manager initialization
* [DEV-234] remove redudant dag instance in txindex
* [DEV-234] fix TestTxIndexConnectBlock and add DAGParams as part of config in DAGSetup
* [DEV-234] TestTxIndexConnectBlock make K=1 to make calculations easier
* [DEV-234] rename TxAcceptingBlock to BlockThatAcceptedTx
* [DEV-234] update block fields names in txindex_test.go
* [DEV-234] rename selectedPathChain -> selectedPathChainSet
* [DEV-149] Add test case for CVE-2018-17144 (Bitcoin DoS/Double Spend bug)
* [DEV-149] change t.Errorf + return to t.Fatalf
* [DEV-149] fix malformed blocks
* [DEV-149] change test blocks to use simnet genesis
* [DEV-92] Covered lookupPreviousNodes in tests.
* [DEV-92] Covered accept.go in tests.
* [DEV-92] Fixed a typo.
* [DEV-92] Covered blockindex.go in tests.
* [DEV-92] Replaced Errorf + return with Errorf. Added the test case to the error messages.
* [DEV-92] Fixed grammar in a comment.
* [DEV-92] Split casting error checking and ErrorCode checking into separate tests.
* [DEV-92] Improved errors.
* [DEV-92] Made errors a tiny bit more descriptive.
