Implemented Trend Log ReadRange for "By Position" and "All" options.

Fixed some issues in the rest of the Trend Log code and the general ReadRange code..

bacnet-stack/include/datetime.h

@@ -131,6 +131,8 @@ extern "C" {
     /* date and time wildcards */
     bool datetime_wildcard(
         BACNET_DATE_TIME * bdatetime);
+    bool datetime_wildcard_present(
+        BACNET_DATE_TIME * bdatetime);
     void datetime_wildcard_set(
         BACNET_DATE_TIME * bdatetime);
     void datetime_date_wildcard_set(

bacnet-stack/include/trendlog.h

@@ -79,6 +79,34 @@ extern "C" {
     time_t TL_BAC_Time_To_Local(
         BACNET_DATE_TIME *SourceTime);
 
+    void TL_Local_Time_To_BAC(
+        BACNET_DATE_TIME *DestTime,
+        time_t SourceTime);
+
+    int TL_encode_entry(
+        uint8_t *apdu,
+        int iLog,
+        int iEntry);
+        
+    int TL_encode_by_position(
+        uint8_t *apdu,
+        BACNET_READ_RANGE_DATA *pRequest,
+        BACNET_ERROR_CLASS *error_class,
+        BACNET_ERROR_CODE  *error_code);
+            
+    bool TrendLogGetRRInfo(
+        uint32_t           Object,   /* Which particular object */
+        BACNET_PROPERTY_ID Property, /* Which property */
+        RR_PROP_INFO      *pInfo,    /* Where to put the information */
+        BACNET_ERROR_CLASS *error_class,
+        BACNET_ERROR_CODE  *error_code);
+
+	int rr_trend_log_encode(
+		uint8_t *apdu,
+		BACNET_READ_RANGE_DATA *pRequest,
+		BACNET_ERROR_CLASS *error_class,
+		BACNET_ERROR_CODE  *error_code);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */