Actually there's a newer version here, with more functions and less bugs (or the opposite) :
http://www.talkchess.com/forum/viewtopi ... 1dc8d9f731
It actually still has a small bug: cleaning the 2nd bitboard doesn't clear the c1 square, so you have to toggle it back to 0 by hand.
I think I'll soon have to add 45° and 315° degrees rotations, as I'm starting to scratch rotating bitboards right now.