explicit location of stylesheet.dir, avoid mysterious exception by setting dummy values to ParameterPair1, 2, 3

more consistent invocation of saxon, avoiding timing for brevity; processScenes.X3dTidy now includes more complete validation to help deconflict false positives and incorrect corrections

provide consolidated processScenes.captureImages for thumbnail + viewpoints of each updated .x3d file (compared to .html)

X3dTidy macro, reviseCurrentDate=false - best to let author decide, sometimes helpful for block updates