Added single category and article pages.

Conflicts:
	sources/controllers/PortalAdminArticles.php
	sources/controllers/PortalArticles.php
	sources/controllers/PortalCategories.php
	themes/default/PortalArticles.template.php
	themes/default/PortalCategories.template.php

Signed-off-by: enyst <engel.nyst@gmail.com>
Update new imported code to ElkArte database layer.

Signed-off-by: enyst <engel.nyst@gmail.com>