bulletproofs: add aggregated verification

Ported from sarang's java code

src/cryptonote_core/blockchain.cpp

@@ -2988,7 +2988,7 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
         }
       }
 
-      if (!rct::verRctSimple(rv, false))
+      if (!rct::verRctNonSemanticsSimple(rv))
       {
         MERROR_VER("Failed to check ringct signatures!");
         return false;

src/cryptonote_core/cryptonote_core.cpp

@@ -896,7 +896,7 @@ namespace cryptonote
           return false;
         case rct::RCTTypeSimple:
         case rct::RCTTypeSimpleBulletproof:
-          if (!rct::verRctSimple(rv, true))
+          if (!rct::verRctSemanticsSimple(rv))
           {
             MERROR_VER("rct signature semantics check failed");
             return false;