PCA plot for Mass Spectra

[Mailaender]

http://sing.ei.uvigo.es/mass-up/ has one which I can't get to work on @openSUSE Linux (white display, no error message) and the 3D nature makes it very hard to grasp in static presentations where you can't rotate. This is a huge feature and requires lot's of processing steps like #3 and #11 and data reduction to be implemented first.