implement new XML API, using XML::Simple

Unfortunately, we cannot yet parse the additional hints (plural forms,
cases, parts of speech, etc., everything inside <repr> tags) because the
XML::Simple API does not retain the correct ordering of CDATA content
mixed with subtags... :-/

This also removes the options -SpellTolerance, -Morphology, and
-CharTolerance, which are no longer supported by the new API (as long as
I can see.)

Note that although the XML contains UTF-8 data, XML::Simple decodes
it to latin1, so we have to re-encode it to get good results.

Makefile.PL

@@ -12,7 +12,7 @@ WriteMakefile(
   'PREREQ_PM'    => { 'Carp::Heavy'       => 0,
                       'IO::Socket'        => 0,
                       'MIME::Base64'      => 0,
-		      'HTML::TableParser' => 0
-		    }
+                      'XML::Simple'       => 0
+                    }
 );