handle_form(): We break the handling of the header and footer

attributes into a special method which does some sanity checking on
the interpolation strings.  First, it checks to see if we're using the
new experimental $-strings, and then depending on the style of
interpolation being used, it extracts the identifiers (variables) in
the string and compares them against a known valid list.  Any invalid
variables are flagged and the changes are discarded.  If the user
simply left off a trailing `s' (as in %(foo)s), then this can be
corrected, but a warning is still printed.

Note: In NonDigest.py we're using a module level function which is
imported by Digest.py's HandleForm().  Makes it convenient to share
code, but this should really be refactored along with
Autoresponse.py's HandleForm().

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