Commits on Sep 14, 2018

1. blockchain: Ensure no stake opcodes in tx sanity. …

   This moves the check for validating that output scripts in non-stake
   transactions do not contain any of the opcodes only allowed in the stake
   tree to the CheckTransactionSanity function where it more naturally
   belongs since it does not require access to transaction inputs as its
   location in CheckTransactionInputs would otherwise indicate.
   
   It should be noted that the check just before the one being moved in
   this change is removed because it checked that specific patterns
   involving stake opcodes where not being used in non-stake transactions
   which is a strict subset of the more general check which ensures there
   are no stake opcodes at all in the output scripts.
   
   Also, to improve efficiency, the check is added to the existing loop
   which already iterates the outputs and the entire block is moved after
   some other faster checks.
   
   Finally, since the transaction sanity code previously did not determine
   if the transaction is a stake transaction which is required for the
   check in question, this adds code to relatively efficiently determine
   that.

   

   davecgh committed Sep 14, 2018
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