SYNOPSIS:
    NORM2 [outputset] [innerset] [sigma] [sigmago] [minlen]

DESCRIPTION:
    Make normals in outputset. The inside is determined by innerset.
    Making normals means adding up all vectors to innserset pixels
    weighted by a gaussian bell with sigma. Sigmago determines how
    far the bell curve is followed. If the sum vector length is
    below minlen, the normals are set to be transparent and faded
    out to full transparency.
