WIP: Batching of txmempool with refactor plumbing
This is basically !793 (closed) with the changes moved to mempool/recursivebatchupdater.(cpp|h)
and mempool/test/recursivebatchupdater_tests.cpp
with as little modifications as possible.
A new argument -experimentalmempool
has been created to enable this feature.
In addition, unit test and functional tests have been modified to also test mempool with this test.
Edited by Dagur Valberg Johannsson