Fix KI daylight saving time calculation.

The previous implementation had the following bugs:
- DST was truncated to end of October
- DST start was off by one week in years where March 1st is a Monday
- DST start was off by one second (1:59:59 -> 2:00:00 -> 3:00:01 instead of the correct 1:59:59 -> 3:00:00 -> 3:00:01)

Tested against tzdata 2009g.

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/FeatureLib/pfPython/cyMisc.cpp

@@ -649,11 +649,11 @@ UInt32 cyMisc::ConvertGMTtoDni(UInt32 gtime)
 	plUnifiedTime utime = plUnifiedTime();
 	utime.SetSecs(dtime);
 	// check for daylight savings time in New Mexico and adjust
-	if ( utime.GetMonth() >= 3 && utime.GetMonth() < 11 )
+	if ( utime.GetMonth() >= 3 && utime.GetMonth() <= 11 )
 	{
 		plUnifiedTime dstStart = plUnifiedTime();
-		dstStart.SetGMTime(utime.GetYear(),3,7,2,0,0);
-		// find first Sunday after 3/7 (second Sunday of March)
+		dstStart.SetGMTime(utime.GetYear(),3,8,2,0,0);
+		// find first Sunday after (including) 3/8 (second Sunday of March)
 		UInt32 days_to_go = 7 - dstStart.GetDayOfWeek();
 		if (days_to_go == 7)
 			days_to_go = 0;
@@ -661,13 +661,13 @@ UInt32 cyMisc::ConvertGMTtoDni(UInt32 gtime)
 
 		plUnifiedTime dstEnd = plUnifiedTime();
 		dstEnd.SetGMTime(utime.GetYear(),11,1,1,0,0);
-		// find first sunday after 11/1 (first Sunday of November)
+		// find first sunday after (including) 11/1 (first Sunday of November)
 		days_to_go = 7 - dstEnd.GetDayOfWeek();
 		if (days_to_go == 7)
 			days_to_go = 0;
 		UInt32 dstEndSecs = dstEnd.GetSecs() + days_to_go * kOneDay;
 
-		if ( dtime > dstStartSecs && dtime < dstEndSecs )
+		if ( dtime >= dstStartSecs && dtime < dstEndSecs )
 			// add hour for daylight savings time
 			dtime += kOneHour;
 	}