changed maxapword from 3 to 4 for convenience with SLAPW
changed maxapword from 3 to 4 for convenience with SLAPW

rongzhen/FPLAPW-KP,rongzhen/FPLAPW-KP,rongzhen/FPLAPW-KP,rongzhen/FPLAPW-KP,rongzhen/FPLAPW-KP