* fix CTxLockRequest::GetMinFee()
* Force regular IS txes to include MIN_FEE * n_inputs fee on creation regardless of auto-IS status
* set_autoix_spork_state should bump mocked time
* make sure IS fee matches the expected one
* turn off spork16 and test all types of txes again
* add locktransaction rpc call
* Remove special instantsend fee for simple transactions
* Function to check if trx is simple enough to be autolocked
* Automatic lock for all received from peers simple trxes
If we get a new transaction with CInv message and it is "simple" and
is accepted in mempool, we initiate its lock. We don't lock orphan trxes
that accepted in mempool after this trx because they are locked by other
peers.
* Automatically lock simple trxes in wallet
* protocol bump for InstantSend without special fee
* Add function to detect used mempool share
* Mempool threshold for auto IX locks
* Add SPORK_16_INSTANTSEND_AUTOLOCKS spork
* Make autolocks active only when spork SPORK_16_INSTANTSEND_AUTOLOCKS is active
* BIP9 autolocks activation
* revert increasing min peer protocol version for mn rank
* move IsTrxSimple check to CTxLockRequest class
* make MAX_INPUTS_FOR_AUTO_IX private member of CTxLockRequest class
* make AUTO_IX_MEMPOOL_THRESHOLD private member of CInstantSend class
* remove locktransaction RPC call
* tests for automatic IS locks
* fix mempool threshod calculation
* bump mocktime in activate_autoix_bip9
* set node times
* no need to spam the node with gettransaction rpc requests that often
* use `spork active` instead of leaking spork logic into tests
* codestyle fixes
* add test description in comments
* fix typo
* sync test nodes more often during BIP9 activation
* Use 4th bit in BIP9 activation
* Fix comments according codestyle guide
* Call AcceptLockRequest and Vote at the first node creating autoix lock
* fix mempool used memory calculation
* rallback not necessary change in CWallet::CreateTransaction
* test for stopping autolocks for full mempool
* Inject "simple autolockable" txes into txlockrequest logic
