[m-rev.] for review: move char_to_doc to pretty_printer.m

[Zoltan Somogyi]

The attached diff moves the implementations of all the X_to_doc
functions in the standard library to pretty_printer.m. The concept
has been reviewed, but this diff contains much more than that, so I would
like it reviewed. Would people be content to do so after commit,
or should I wait for a review before then?

Zoltan.
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