Atom and bond partial fingerprinting and atom coloring with smi2gif

• Atom and bond partial fingerprints added to the fingerprint toolkit - dt_fp_partfp()
• What use are atom fingerprints? What's Stigmata?
• $DY_ROOT/contrib/src/applics/stigmata/stigmata.c updated to reflect newly supported fingerprint function.
• New options added to smi2gif to generate atom colors using ALAB datatype in a TDT file. Example