r174504 - Optionally derive formatting information from the input file.

[Sean Silva]

> Optionally derive formatting information from the input file.

A more sophisticated extension of this might be the solution to the
"StringSwitch" issue.

However, going down that road has the disadvantage that it means that
the output depends on the formatting of the input, which loses (to
some extent) the "canonicality" property of the formatting. (Has this
been discussed elsewhere?).

-- Sean Silva