plsmem: Set the memory area to be plotted 

DESCRIPTION:

    This memory will have to be freed by the user! 

SYNOPSIS:

plsmem(maxx, maxy, plotmem)

ARGUMENTS:

    maxx (PLINT, input) :    Size of memory area in the X coordinate. 

    maxy (PLINT, input) :    Size of memory area in the Y coordinate. 

    plotmem (void *, input) :     Pointer to the beginning of the
    user-supplied memory area.