Add option to disable minting

Start test nodes with gdb

Add multitx option

When this option is activated the sendtoaddress and sendmany RPCs will generate multiple transactions if the operation doesn't fit in a single transaction.

In this case the RPCs will return a string with all transaction hashes separated by newlines.

Change default splitshareoutput to 0

Add mergeoutputs RPC

Reduce disk writes when multiple inputs are from the same transaction

Log reason for some transaction creation failures

Do not add to coinstake inputs that would be split

Change version to 5.2.0