Pelzini

Converts an internal type into the database-specific SQL type.
The defined internal types are:
  - serial: a number that automatically increments whenever a record is added
  - smallnum: a small number. needs to be able to hold at least 32,767 possible values (e.g. a 16-bit signed integer)
  - largenum: a large number. needs to be the same size or larger than a serial type
  - string: a character field long enough to hold identifiers of objects (e.g. function names)
  - text: a field that can hold arbitary pieces of text larger than 65536 chars in length.