Package Parsers

Conversion plugins for various structure formats

The recognized structure formats are defined by subclassing StructureParser,
by convention these classes are named P_<format>.  The parser classes should
to override the parseLines() and toLines() methods of StructureParser.
Any structure parser needs to be registered in parser_index module.

For normal usage it should be sufficient to use the routines provided
in this module.

Content:
    StructureParser -- base class for concrete Parsers
    parser_index    -- dictionary of known structure formats
    getParser       -- factory for Parser at given format
    inputFormats    -- list of available input formats
    outputFormats   -- list of available output formats

Return Parser instance for a given structure format.
Raises StructureFormatError exception when format is not defined.