- better accuracy for InvSqrt thanks to new coeff and 8 bytes less (http://www.multiwii.com/forum/viewtopic.php?f=8&t=4246&p=51412#p51412)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1679 02679b44-d973-9852-f2fa-63770883b36c