kdiff3 0.9.98

Update kdiff3 to latest version (0.9.98)
@ferventcoder : Both way to write those links work, I could go with:
http://downloads.sourceforge.net/project/kdiff3/kdiff3/0.9.98/KDiff3-32bit-Setup_0.9.98-3.exe
http://downloads.sourceforge.net/project/kdiff3/kdiff3/0.9.98/KDiff3-64bit-Setup_0.9.98-2.exe

It would be less changes.