Any projects which want to use Hush code from now on will need to be licensed as
GPLv3 or we will send the lawyers: https://www.softwarefreedom.org/
Notably, Komodo (KMD) is licensed as GPLv2 and is no longer compatible to receive
code changes, without causing legal issues. MIT projects, such as Zcash, also cannot pull
in changes from the Hush Full Node without permission from The Hush Developers,
which may in some circumstances grant an MIT license on a case-by-case basis.
Ported txnmall.sh to Python, and updated to match
recent transaction malleability changes.
I also modified it so it tests both double-spending
confirmed and unconfirmed (only-in-mempool) transactions.
Renamed to txn_doublespend, since that is really what is
being tested. And told the pull-tester to run both
variations on this test.
