I am not very familiar with the Blender testing system, how can I import something from the module import_svg.py running the test suite as a standalone Python if the bpy module only exists inside Blender? Without that I can't test SVGPathData class...

Improve comment line wrapping.

Add comment about arc flags handling

Fix imports in tests.

In D10433#262798, @Germano Cavalcante (mano-wii) wrote:

I don't know this code, but I think it could have more descriptions such as:

• what are those numbers 7, 3, 4;
• what is each command;
• where that ReadFlagTest is being used ...

I've added a patch for this in D10433.

Remove accidental changes.