SYNOPSIS:
    FIND_DG_ADJPATCHES myset tempset patchset maxsteps minnum outfd

DESCRIPTION:
    Search all voxels in myset for neighbouring patches. Myset
    will temporarily be mapped to tempset while the search proceeds.
    If voxels from patchset are found within maxsteps rounds of
    searching, they are checked for their D and G entries.
    If more than minnum unique entries are found, an info record
    stating the current voxel and the neighbouring DG markers is
    written to outfd.
