Improve performance of validator checks

[GerdP]

Some tests are executed for each element of the data set although they are only interested in tagged objects. Mosts tests which extend Test.TagTest should override method isPrimitiveUsable()

    @Override
    public boolean isPrimitiveUsable(OsmPrimitive p) {
        return p.isTagged() && super.isPrimitiveUsable(p);
    }

to improve performance.
Be careful, see r16154