d3.append(node) is not working in d3.js, so needs to be changed to the function returning node

[shamansir]

I can't believe I used d3_tiny's .append(node) ability every time, but by docs it seems it is exactly what actually happened.

[shamansir]

The difference is that I usually use code like this:

var d3Selection = d3.select(...)...;
var anotherD3Selection = d3.select(...)...;
d3Selection.....append(anotherD3Selection.node());

but according to d3.js docs, it was wrong from the start (but so intuitive!)

[shamansir]

And so, relates to #405

[shamansir]

For now, I'm changing it to:

var ƒ = Rpd.unit;

d3.....append(ƒ(d3().....node()));

But probably in some cases it would be convenient to use selection.append('svg:text') syntax. And make d3_tiny use it too.

[shamansir]

Fixed with #440