[Edbrowse-dev] return value from removeChild

[Kevin Carhart <kevin@carhart.net>]

I found some evidence that our removeChild function should return the 
removed node to javascript, instead of returning undefined

A prominent library file includes this line:

a.removeChild(b).style.display = 'none';

So it's expecting something to be there.

And MDN talks about removeChild being called in two possible ways, one of 
which returns the removed node:

var oldChild = node.removeChild(child);

"The removed child node still exists in memory, but is no longer part of 
the DOM.  With the first syntax-form shown, you may reuse the removed node 
later in your code, via the oldChild object reference."

Could this be done by renaming removeChild to eb$rmcd in jseng-duk.c, and 
then in startwindow maybe this?

mw0.removeChild = function(c) {
this.eb$rmcd(c);
return c;
}

The side effects are all nice and stable already, so leave them alone and 
just deal with the change in what is returned to JS using a JS wrapper.
If this sounds OK, I'll turn this in.

thanks
Kevin