Change to infodir (/usr/testbed/expinfo) handling; experiment
directories are now placed in a project subdirectory, to avoid blowing out the max number of subdirs (32K in FreeBSD). Dirs are now called $pid/$eid/$idx. Added sanity checks to batchexp, swapexp, and endexp to watch for the case that testbed admin installed the new code but did not run the fixup script as instructed in doc/UPDATING.
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