Fix issue with ElementTree when lxml is not available

[embray]

I noticed this trying to get the webbpsfgui working on my Windows machine, where I don't have lxml installed. So it tries falling back to using Python's built-in xml.etree.cElementTree. However there are several places that are using lxml.etree.Element.iterchildren which is not supported in xml.etree so we have to provide an approximate replacement for it.

Once I got this going I was able to get the GUI to at least launch--not sure if there other issues but at least it runs.

[embray]

Thanks--for merging all the PRs. Those were just things I had to do to get it to "work"

[mperrin]

No, more thanks to you for fixing those. Good details to catch to make it more portable, much appreciated.

Sorry for totally failing to get together in person at all this week - my observing schedule put me way more out of commission than I'd expected, not just staying up all night but working on data and software for that project during the afternoons.

Are you in next week? I'll be working Mon-Weds at least, maybe Thurs also.

• Marshall

On Dec 13, 2013, at 1:59 PM, Erik Bray wrote:

Thanks--for merging all the PRs. Those were just things I had to do to get it to "work"

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[embray]

No problem I figured as much, and things got even more screwed up with the closures. We'll work something out.