new theme "pfsense_ng_fs" & allow themes to add / delete additional widget columns

@rbgarga

Creates a new theme called 'pfsense_ng_fs' a clone of the pfsense_ng theme but is amended to take up the width of the window.

Commit ca794dd simply copies all files from the pfsense_ng folder into a new pfsense_ng_fs folder

Changes:

all.css:
- edited some css to make the theme take up the windows full width

loader.js:
- added jQuery to display new buttons (add/remove) columm.
- added jQuery to create new columns
- added jQuery to delete columns

index.php:
- amended to display multiple columns if a theme names ends in '_fs' (it would require the jQuery I have used in loader.js to be present in the themes folder).
- the changes index.php should not affect the other themes. Only if the themes name ends with '_fs'