Transactions with multiple programs. (#1381)

Transactions contain a vector of instructions that are executed atomically.
Bench shows a 2.3x speed up when using 5 instructions per tx.

src/rpc.rs

@@ -173,7 +173,7 @@ impl RpcSol for RpcSolImpl {
         Ok(
             match meta.request_processor.get_signature_status(signature) {
                 Ok(_) => RpcSignatureStatus::Confirmed,
-                Err(BankError::ProgramRuntimeError) => RpcSignatureStatus::ProgramRuntimeError,
+                Err(BankError::ProgramRuntimeError(_)) => RpcSignatureStatus::ProgramRuntimeError,
                 Err(BankError::SignatureNotFound) => RpcSignatureStatus::SignatureNotFound,
                 Err(err) => {
                     trace!("mapping {:?} to GenericFailure", err);