Don't print stack trace on unrecognized option

Invoking JastAddJ with the option --version produces the following output:

Exception in thread "main" java.lang.Error: Command line argument error: option --version is not defined
        at AST.Options.addOptions(Options.java:111)
        at AST.Frontend.processArgs(Frontend.java:177)
        at AST.Frontend.process(Frontend.java:46)
        at org.jastadd.jastaddj.JavaCompiler.compile(JavaCompiler.java:23)
        at org.jastadd.jastaddj.JavaCompiler.main(JavaCompiler.java:18)

We should not print stack traces for such simple errors.

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