and     :  AND-function of two bitplanes.
bitpl out = (bitpl 1 in) AND (bitpl 2 in).

cmd : and bit1 in, bit2 in,bit out,image
dflt: and    1   ,    2   ,   2,     B
range:     <1,8> ,  <1,8> ,  <1,8>,<A-D>
