support for Inkscape layers

[alpharesearch]

I did add Inkscape layers to the SVG output, please have a look at my clone and let me know if this is something you are interested... if so I could create a patch or you can just copy the part.

[alpharesearch]

please have a look at my layer branch for some Inkscape layer support

[alpharesearch]

Sorry for waisting your time; this is the first time I use Python programing language and I'm not used to indentations like this... I had missed a couple of tabs on the reg mark stuff and this was the reason it was producing invalid SVG output if no reg marks were selected. I think the layer thing is working now OK, I can produce everything on a different layer and of reg marks are selected it puts the right size on the page. I started on two new layers for the new object outline... I think this may could produce a SVG were the tabs are not cut off.

PS: the double line was a merge artifact...

[addam]

You're not wasting my time - thank you, you're doing good work.
By the way, the indentation I use is non-standard. It would be more correct to use four spaces instead of each tab, but this way just seems more natural to me.