Redo the Edit Experiment Metadata page; turned it into a standard form
based page that looks like the original Begin Experiment page. Be sure to look at the page in both admin mode and non-admin mode since I had some trouble determining how swappable is treated these days. Oh, added the ability to convert non-batch experiments into batch, and back. The experiment must be unlocked and in the swapped state to go in either direction. Also added the cpu_usage and mem_usage slots for editing. I added a comment about planetlab only, since otherwise we would just confuse normal users who have no idea what they mean. I could conditionalize them on having plab nodes, but thats difficult to figure out in the web page when the experiment is swapped out, so lets not worry about it.
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