Implement two requests by Eric:
* The checkout directory now includes just the datastore directory and tbdata/nsfile.ns. This removes a bunch of clutter. * You can now run template_commit in any subdir of a checkout; the python wrapper will crawl upwards looking for the .template file. Note that I removed the option that allowed you to do a commit from the template tree in /proj/pid/templates since that directory will ultimately go away (or at least hide from view), and cause it conflicted with the new option and I didn't want to make things any messier for no reason.
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