Metadata Display Macro: provide option to hide table headline

There should be an option within the macro to define whether or not the table heading should be displayed or not (render mode: table).

It has yet to be decided wether this should be a configuration item within the macro or a general (global) setting.

The headers are the metadataset titles. this grouping should be deactivatable with a new macro option "No metadata set grouping". By activating this new option you should end up with a basic table that shows all configured metadatafields of this page.