New highlighter for Erlang

This is a first version featuring most of the important syntax elements
as comments, keywords, atoms and variables etc.

Btw fixed prolog parsed to behave like the erlang one when highlighting
atoms and variables.

prolog.jsf

@@ -4,11 +4,11 @@
 =Comment	green
 =Constant	cyan
 =Escape		bold cyan
-=Variable	cyan
 =Keyword	bold
 =Bad		bold red
 
-=Brace
+=Brace		#magenta
+=Variable	fg_310
 =Predicate	red
 
 :idle Idle