Shrink extensions with scratch, add ltrace for dev, and format #28
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This was mostly separated from #19 because some of it seemed unrelated. I can also fold this back into that branch, but thought it might make sense to make these changes separately.
Here we use scratch to make the image for extensions as small as possible. The
ltraceutility was added for ability to trace shared library calls and there are some minor formatting changes included as well.