This commit removes the CLI option -opretmintxfee, makes it always
enabled, changes the required fee rate and changes which OP_RETURNS
get "amnesty" and do not need to pay this fee rate.
To protect users who are not using opreturn we prevent any use of z_sendmany
with absurd fees if opreturn is not being used, so this change only affects
users who are adding opreturn data. Since there is no way to currently send
opreturn data via a GUI this still protects all GUI users from absurd fees
while allowing CLI users to decide to use higher fees.
Technically we should take this lock but it has never been there before
and it leads to potentially large slow downs when mining with multiple cores.
We see basically the same hashrate for a single core if we have the lock or
not and that makes sense, since there is only one core, there are no other
mining threads that have to wait. But on one particular CPU I saw a 6% slower
hashing when mining with 2 threads and 35% slower with 3 threads.
This change also means debug builds will coredump if mining is enabled.
Technically we should take this lock but it has never been there before
and it leads to potentially large slow downs when mining with multiple cores.
We see basically the same hashrate for a single core if we have the lock or
not and that makes sense, since there is only one core, there are no other
mining threads that have to wait. But on one particular CPU I saw a 6% slower
hashing when mining with 2 threads and 35% slower with 3 threads.
This change also means debug builds will coredump if mining is enabled.
