Add jqGrid (version 4.4.3, latest doesn't work on local data)
Implement griddata type

- Use plain jqGrid functionality on series and tables data
- Use a special case for the glossary, i.e. allow the definition to be
  edited by a WYSIWIG editor
Fix xenith run-time

- Glossary with images (or other taggs) doesn't work because a title was
  added with double-quotes.
- In the end decided to leave title out, it showed as a tooltip through
  the Xerte one
- Changed x_AddLineBreaks to not replace the line breaks if the text field
  starts with a <p>, because it is likely to come from the WYSIWIG editor