* Removed the "No borders" option from general borders setting
since it's a style choice.
* Added inherit, initial and unset as border style options.
* Made the border settings disabled if "Theme default" is selected.
* Changed the transparent colour to be "Theme default" which means
apply no colour at all.
This commit adds the option for borders to be added and
styled, background colours to be set, and width to be set for tables
in the Atto HTML Editor. For those that desire to restrict
use of this, the plugin settings allow the admins to restrict
how much freedom their users have with borders.
Andrew Nicols