Changes send_transaction to not be recursive

send_transaction had an edge case that was treated recursively. Return a receipt instead and handle that in the caller

pisa/errors.py

@@ -9,6 +9,9 @@ APPOINTMENT_WRONG_FIELD = -7
 APPOINTMENT_CIPHER_NOT_SUPPORTED = -8
 APPOINTMENT_HASH_FUNCTION_NOT_SUPPORTED = -9
 
+# Custom RPC errors
+RPC_TX_REORGED_AFTER_BROADCAST = -98
+
 # UNHANDLED
 UNKNOWN_JSON_RPC_EXCEPTION = -99