Changes:
- New: VRML2 export/import for better compatibility with 3d-printers
- New: "Clear all layers" button in layers panel included
- New: more convenient placing for primitives - "Place on pen" options and sub-options, see primitives tool
- Improvement: File dialog for Windows got better functionality (just become standard) - http://pilgway.com/files/filedialog.png
- Bugfix: Baking ppp->ppp problem fixed, there was unnecessary seams while baking
- Bugfix: different other mantis reported problems fixed