is the explicit removeChild in managed-append-child necessary?

[thedavidmeister]

while writing tests for #205 i noticed that ??appendChild--internal-remove does NOT fail when the following code is removed from managed-append-child:

    (when (.-parentNode child)
     (.removeChild (.-parentNode child) child))

so either it is protecting against something the test doesn't consider or it is cruft.

removing it was out of scope for #205 so i put a followup ticket here for further investigation.

[burn2delete]

https://developer.mozilla.org/en-US/docs/Web/API/Node/appendChild

Not needed as per docs, can be removed safely.

[burn2delete]

removed in 7.2 branch.