Adapt test to bank returning descending /history elements.

src/bank-lib/test_bank_api_new.c

@@ -111,7 +111,7 @@ run (void *cls,
                                     EXCHANGE_ACCOUNT_NUMBER,
                                     TALER_BANK_DIRECTION_CREDIT,
                                     NULL,
-                                    5),
+                                    -5),
 
     TALER_TESTING_cmd_bank_history ("history-1d",
                                     bank_url,

src/bank-lib/testing_api_cmd_history.c

@@ -67,7 +67,7 @@ struct HistoryState
   /**
    * How many rows we want in the result.
    */
-  unsigned int num_results;
+  long long num_results;
 
   /**
    * Handle to a pending "history" operation.
@@ -781,7 +781,7 @@ TALER_TESTING_cmd_bank_history
    uint64_t account_no,
    enum TALER_BANK_Direction direction,
    const char *start_row_reference,
-   unsigned int num_results)
+   long long num_results)
 {
   struct HistoryState *hs;
   struct TALER_TESTING_Command cmd;

src/include/taler_testing_bank_lib.h

@@ -105,7 +105,7 @@ TALER_TESTING_cmd_bank_history
    uint64_t account_no,
    enum TALER_BANK_Direction direction,
    const char *start_row_reference,
-   unsigned int num_results);
+   long long num_results);
 
 /**
  * Create a "reject" CMD.