Metamorph: allow both sanitized and unsanitized delimiters

If the XML was not completely sanitized, the delimiter can still be
'&#130;&#10;'.  This is needed as a result of c62aca3.
Do not put XML comments into the original metadata table
Merge pull request #1448 from melissalinkert/metamorph-delim-part-2

Metamorph: allow both sanitized and unsanitized delimiters