Documentation. Tracing, Tips and Calligraphy tutorials update (partially translated).

Documentation. Updating all tutorials (except advanced and shapes). New Greek translation of tracing.

Tutorials. Global tutorials update (see Bug #169020, Bug #672423 and Bug #438307).

Tutorials. sk tutorials updates, id basic tutorial update, and new sk interpolate tutorial.

Tutorials: Bitstream fonts replaced with sans and serif

Tutorials. New Farsi tutos. Tutorials are now optimized with Scour.

Polish and Slovak tutorials translation update (SVG files).

Calligraphy tutorials update (SVG). See Bug #440492 (tutorial-calligraphy: Some values and word are obsolete).

Tutorials update

Regenerated all tutorials from inkscape-doc primarily to add new tutorials translated into Polish, but also those where some translations existed. Hopefuly not messed around too much.