This accomodates large tx sends of up to 500k bytes.
However they are unlikely to be propogated by your daemon as the
default relay limit it imposes is 100K.
- incoming buffered network requests limited to 150,000 bytes
which I believe is ample for a genuine client
- if exceeded, the connection is dropped
- raise outgoing data limit for RPC connections to 5 MB - expect
sessions calls can be long and connection is implicitly trusted
- similarly raise incoming buffered data limit to 5 MB for RPC
connections