Fixed bug in acot_fixed_bsp; slightly faster ln2_fixed 
Fixed bug in acot_fixed_bsp; slightly faster ln2_fixed 

tectronics/mpmath,tectronics/mpmath,upiterbarg/mpmath,Alwnikrotikz/mpmath,Alwnikrotikz/mpmath,thegooglecodearchive/mpmath,upiterbarg/mpmath,thegooglecodearchive/mpmath