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

[Zoltan Somogyi]

For review of the idea of moving x_to_doc functions to pretty_printer.m.
If approved, I would move all such functions to pretty_printer.m,
leaving obsoleted forwarding functions behind. When we delete
these later, one cause of circular .trans_opt dependencies
will have its applicability domain significantly reduced.
Specifically, it should get rid of the dependency of
modules defining functions such as float_to_doc and uint_to_doc
on pretty_printer.m, though the dependencies of modules
defining operations that convert compound values such as
arrays and bitmaps to docs on pretty_printer.m would remain
in cases where the required types and access predicates
are not exported to pretty_printer.m. This would be the case
e.g. for tree234_to_doc, unless e.g. we export tree234_to_lazy_list
(in a non-public interface) to pretty_printer.m.

Zoltan.
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