Improve output quality

- Use saveas instead of print for raster formats, since it produces
very similar results (150dpi appears to be the default).
- Use print instead of saveas for PDF output.
- Use ‘painters’ renderer for vector formats as suggested by MATLAB’s
documentation.
- Produce PostScript Level 3 output on MATLAB R2014b.
Fix PostScript printing margins on MATLAB R2014b

Introduce workaround to a bug on MATLAB R2014b which causes it to
always produce a full-page .eps print independently of figure size.
Might not be backwards-compatible.