1.0: 2000/1

     2000/3/30: fix a small bug. Duplicated indices may be included in the working set.

1.1: 2000/7

2.0: 2001/4

2.01: 2001/5

2.04: 2002/5/7
	bug of -v ?? -t 0 fixed

2.05: 2003/8/3
	efficient implementation for linear SVM

2.06: 2006/8/
	check if sub-problems change solutions (avoid infinite loop)
	32/64 bit problem 
	minimal cache size (qpsize columns)