Some date GMT fixes.
Add search instructions.
Add search instructions to wrong tab, fixed.
General cleanup.

Move the settings and options to the settings subfolder.
Ensure no direct access to any core PHP files is permitted.
Remove the "cn_" prefix from all actions. Instead it is added, when
added the action/filter.
Remove the use of the deprecated displayMessages() function throughout.

Closes gh-206
Closes gh-205
Closes gh-204