Remove cleanup working directory changes; always use absolute paths. #252
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The cleanup routines, and some other locations, relied on persistent changes to the working directory despite being in the context of yields where other changes might take place. This may be at fault for #249, for example, and generally seems unsafe.
In an attempt to prevent the working directory from being a problem, this PR removes all
os.chdircalls. It instead passes paths between methods, making them absolute on the first opportunity, and sets the working directories of subprocesses at the point of starting them. The cleanup mechanism still feels risky – it would be safer to restrict removals to a set of plausible temporary file patterns – but this should at least make things a bit safer, and doesn't involve needing to choose that set yet; I might try to come up with that later if I have time.I'm leaving this as a draft until I can test it.