PLSQL highlighting support

[nathany]

Marcos Sebastián Uslenghi requested PLSQL (Oracle) support:

Add PLSQL highlighting support.
Example:

DECLARE 
 v_renglon NUMBER := 1;
 BEGIN
 GO_BLOCK('GRILLA');
 FIRST_BLOCK;
 LOOP
 :grilla.renglon := v_renglon;
 EXIT WHEN :SYSTEM.LAST_RECORD = 'TRUE';
 v_renglon := v_renglon + 1;
 NEXT_RECORD;
 END LOOP;
 END;

The uppercase are reserved words. I know PLSQL and any help you need I'm at your disposal

See also: http://pygments.org/demo/3018/

From Redmine: http://odd-eyed-code.org/issues/259