Add display rules method
Add - rule add link
Improve code for displaying rules
Move bracket to a new line
Remove overqualified links
Add navigation

Replace U_BACK
Replace language var
Fixes for categories and add rule
Some fixes for rules navigation
Add functional tests for the main board rules controller
Proper docblock commenting
Minor tweaks to database_base_test
Make extension enabling functional test case generic
Enhance documentation and remove namespace
Remove board rules mention in a comment
put back namespacing for it to work while in our extension
Use sql escape for vars in the sql statements
Replace is_category code
Replace current_level code
Remove nestedset