Centre the MathCAT Preferences dialog on screen. (#113) #363

Job	Run time
Build 64 bit windows pyd file	3m 29s
zip up the rules directory	1m 21s
Build 32 bit windows pyd file	4m 14s
Build linux pyd file (64-bit intel)	1m 53s
l10n	22s
build-addon	39s
Pre Release	27s
	12m 25s

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