LDM 'display message' plug-in.

Plugin adds a text message within the display.

Parameters are set via the LDM admin/settings page:

- Extra active/inactive
- Message (bbcodes, smilies, images, html allowed according to normal admin settings)
- Placement
- All/category/single item displays

If the last option is set to 'single item displays', the extra will only be active when
a single linkbit is being shown. In other words, you must select a template_linkbit 
(e.g. photo, title) that takes you from the full listing to an individual entry.  
There will be no effect when using the standard modern/tabular linkbits as template_linkbit.

