Remove VOException base class because there are now only parse errors

src/main/java/de/prob/voparser/VOException.java

-package de.prob.voparser;
-
-public class VOException extends RuntimeException {
-	private static final long serialVersionUID = 1L;
-	
-	public VOException(final String message, final Throwable cause) {
-		super(message, cause);
-	}
-	
-	public VOException(final String message) {
-		this(message, null);
-	}
-	
-	public VOException(final Throwable cause) {
-		this(cause == null ? null : cause.toString(), cause);
-	}
-}

src/main/java/de/prob/voparser/VOParseException.java

 package de.prob.voparser;
 
-public class VOParseException extends VOException {
+public class VOParseException extends RuntimeException {
 	private static final long serialVersionUID = 1L;
 	
 	public VOParseException(final String message, final Throwable cause) {