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Sam_init_db

  Create the initial datablocks required to describe a molecule. A datablock entry describing the sequence (e.g. a_residue_type for a molecule named A) must exist in the database. If an entry describing the residue name also exists (in this case a_residue_name), it will be used. Otherwise the first residue is called `1', the next `2' etc. The sequence can be entered (in 3 letter code) as a formatted O datablock. All coordinates get the value (1500.0, 1500.0, 1500.0) so do not be surprised if you get some strange looking bonds.