various fixes for show_transfers, locked_transfer command, blocking of invalid TXs

src/cryptonote_basic/cryptonote_basic_impl.cpp

@@ -82,7 +82,7 @@ namespace cryptonote {
   //-----------------------------------------------------------------------------------------------
   bool get_block_reward(size_t median_weight, size_t current_block_weight, uint64_t already_generated_coins, uint64_t &reward, uint8_t version) {
     static_assert(DIFFICULTY_TARGET_V2%60==0&&DIFFICULTY_TARGET_V1%60==0,"difficulty targets must be a multiple of 60");
-    const int target = version < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET_V2;
+    const int target = DIFFICULTY_TARGET_V2;
     const int target_minutes = target / 60;
     const int emission_speed_factor = EMISSION_SPEED_FACTOR_PER_MINUTE - (target_minutes-1);