Improved the styling of the button to add channel.

Borrowed graphic from Iguana.
Minor changes to spacing and logging.
Switched the add channels view to use a datatable and give descriptions of the channels.
We now serve up more information for the channel manager import files screen

We get this by parsing the XML files.
Added in code to support highlighting of searches and so on.
Refactored the dashboard code.

General idea is that the back end server just serves up plain JSON and
the configuration of the jQuery datatable is all done in client side Javascript.

Also shifted much more of the styling into CSS (although using fairly garish colors :-)).
Changed the way we send data to the list of imported channels.
Changed styling to use CSS styles etc.

(with horrendous colors)