KConfig sync speedup patch rev 1

[Ian Reinhart Geiser]

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Hi,
	At n7y I worked out this patch with the help of david.  It seems to speed up 
some apps when i measure them with calltree.  The issue was that before this 
patch every time you call sync the config file is reparsed.  This patch 
causes the config file not to be reparsed unless it has changed on disk since 
the last write.

	In kmail with calltree without it I seem to see 10% of startup time spent in 
KConfigINIBackend::sync(), where as after the patch it only spends about 
7%....  Im still not sure if these numbers are accurate, so im hopeful others 
can test, modify this patch.

	The idea is that a stat and compair of QDateTime is faster than the reparse.  

	Thanks
	-ian reinhart geiser
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- --:Ian Reinhart Geiser <geiseri at yahoo.com>
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