Add javascrip function check & call from string functions

Check if a string is a function.
And call this string with arguments.

Update SQL files for better layout order

4dev/database/table/edit_page.sql

@@ -9,6 +9,7 @@
 CREATE TABLE edit_page (
 	edit_page_id	SERIAL PRIMARY KEY,
 	content_alias_edit_page_id	INT, -- alias for page content, if the page content is defined on a different page, ege for ajax backend pages
+	FOREIGN KEY (content_alias_edit_page_id) REFERENCES edit_page (edit_page_id) MATCH FULL ON DELETE RESTRICT ON UPDATE CASCADE,
 	filename	VARCHAR,
 	name	VARCHAR UNIQUE,
 	order_number INT NOT NULL,
@@ -17,6 +18,5 @@ CREATE TABLE edit_page (
 	popup	SMALLINT NOT NULL DEFAULT 0,
 	popup_x	SMALLINT,
 	popup_y SMALLINT,
-	hostname	VARCHAR,
-	FOREIGN KEY (content_alias_edit_page_id) REFERENCES edit_page (edit_page_id) MATCH FULL ON DELETE RESTRICT ON UPDATE CASCADE
+	hostname	VARCHAR
 ) INHERITS (edit_generic) WITHOUT OIDS;