increased max TX size from HF2; bumped version number

src/cryptonote_core/tx_pool.cpp

@@ -112,8 +112,8 @@ namespace cryptonote
 
     uint64_t get_transaction_weight_limit(uint8_t version)
     {
-      // from v8, limit a tx to 50% of the minimum block weight
-      if (version >= 8)
+      // from v2, limit a tx to 50% of the minimum block weight
+      if (version >= 2)
         return get_min_block_weight(version) / 2 - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;
       else
         return get_min_block_weight(version) - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE;