[m-rev.] for post-commit review: pretty_printer.m

[Zoltan Somogyi]

For review by anyone.

What should be reviewed is not so much the diff, as the new contents
of pretty_printer.m. I am after feedback mostly on the new
NOTES_TO_IMPLEMENTORS I added. Acting on those would break
compatibility with callers (which this diff does NOT do), but the results
may be worth it.

Zoltan.
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