experiment code. No longer uses another table. Rather, the experiment
record contains a couple of extra fields for the batch system. Also
combined some of the backend code (no longer a killbatch script).
Also added scriptable experiments; the batchexp program in the bin
directory can start an experiment from the command line, and in fact
is used from the web page for both batch experiments and immediate
experiments (-i option). All of the DB code that was in the web
interfaces was moved to batchexp.

replaced by the "images" table. New os_info table is added. New web
pages to add and delete OSIDs to/from the os_info table, for use in
the NS file. tb-create-os is gone. handle_os no longer operates on the
tbcmds file, and no longer writes anything into the ir file. Moved the
setting up of os state (nodes table) from os_setup to handle_os, where
it should be. os_load and sched_reload now take a single argument, the
name of the imageid from the images table.

the testbed list.

of all that duplicated goo).
Clean up all the formerror code, calling standard FORMERROR() function.
Get rid of all the inline DB specific constants, moving them to dbdefs.php3
include file.