Ignore some generated files in parsers.

Note there are some other files named *.generated.* inside the parsers which
are actually checked in.

Deleting them didn't break ant build, but this commit leaves them alone.
Fix generics warning.

In Automata.java, static methods cannot use type parameters of
a generic class.

In JavaSymbolicKRun.java a raw Cell was allocated in the wrap method which seems
not to actually be called anywhere, so I just made it Cell<Term>.
If necessary, could get fancier like

    public static <T extends Term> Cell<T> wrap(T t, String label) {
        Cell<T> cell = new Cell<T>(label,t);
        System.out.println("Content Kind: "+t.kind());
        return cell;
    }