Merge #7648: BIP9 versionbits softfork for BIP68, BIP112 and BIP113
71527a0 Test of BIP9 fork activation of mtp, csv, sequence_lock (NicolasDorier)
19d73d5 Add RPC test for BIP 68/112/113 soft fork. (Alex Morcos)
12c89c9 Policy: allow transaction version 2 relay policy. (BtcDrak)
02c2435 Soft fork logic for BIP68 (BtcDrak)
478fba6 Soft fork logic for BIP113 (BtcDrak)
65751a3 Add CHECKSEQUENCEVERIFY softfork through BIP9 (Pieter Wuille)