Make invsqrt() evenly accurate to sqrt()
Make invsqrt() evenly accurate to sqrt()

According to commit 9fd6948a8d07955345cb0292673952918d4eb7c5
"Makes sqrt more accurate", the invsqrt() is one Newton's step less accurate than sqrt()

RafaelRMA/pal,Adamszk/pal3,parallella/pal,debug-de-su-ka/pal,olajep/pal,eliteraspberries/pal,mateunho/pal,eliteraspberries/pal,mateunho/pal,parallella/pal,debug-de-su-ka/pal,mateunho/pal,mateunho/pal,eliteraspberries/pal,aolofsson/pal,aolofsson/pal,8l/pal,eliteraspberries/pal,debug-de-su-ka/pal,RafaelRMA/pal,olajep/pal,Adamszk/pal3,aolofsson/pal,Adamszk/pal3,RafaelRMA/pal,Adamszk/pal3,parallella/pal,RafaelRMA/pal,debug-de-su-ka/pal,mateunho/pal,8l/pal,eliteraspberries/pal,8l/pal,olajep/pal,debug-de-su-ka/pal,aolofsson/pal,8l/pal,parallella/pal,olajep/pal,parallella/pal