[m-rev.] For review: initialise default pretty_printer formatters

[Ralph Becket]

I've committed this change.

Ralph Becket, Wednesday,  8 August 2007:
> Estimated hours taken: 4
> Branches: main
> 
> Define pretty_printer formatters for some common standard library types.
> Include these formatters in the default pretty_printer formatter_map.
> Add a useful function to the pretty_printer interface.
> 
> library/array.m:
> library/char.m:
> library/float.m:
> library/int.m:
> library/list.m:
> library/string.m:
> library/tree234.m:
> 	Add <type>_to_doc functions.
> 
> library/pretty_printer.m:
> 	Added function format_arg/1.
> 	Initialise the default formatter_map to use the <type>_to_doc
> 	functions.
> 
> tests/hard_coded/Mmakefile:
> tests/hard_coded/test_pretty_printer_defaults.exp:
> tests/hard_coded/test_pretty_printer_defaults.m:
> 	Test case.
...
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