Change history of Rough sets a la Relations

Rev	Date	Modified by	Minor edit	Spam	WikiText	Revert to
4	2009-07-14 14:23:00	GAM	no	no	4	4
3	2009-07-13 06:43:22	arjen	no	no	3	3
2	2009-07-12 20:03:12	GAM	no	no	2	2
1	2009-07-12 20:02:47	GAM	no	no	1	1
0	2009-07-12 19:57:39	GAM	no	no	0	0