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using a sajax call for cancelation, but the main invocation uses a
plain iframe. This has the added benefit of scrolling more nicely
instead of jumping back to the top with each write.

Looks like xmlhttprequest or its impl in at least firefox is
moderately broken, so that mulitple simultaneous requests get very
confused with each other, and things break.

unanticipated breakage. If that happens, just need to back out the
changes under the "suexec-stuff" tag. However, the better solution will
probably be to fix the PHP scripts that break by adding the proper
groups in the call to suexec (in the web page, see below) or by fixing
the backend Perl script that breaks.

This fix is primarily to address the problem of some users being in more
groups (cause of subgroups) then the max number of groups allowed
(NGROUPS).  The groups that really mattered (say, for creating an
experiment in a subgroup) could be left out cause they were at the end
of the list.

* suexec.c: Change how groups are handled. Instead of taking a single
  gid argument (the gid to setgid as), now takes a comma separated list
  of groups. Further, instead of doing a setgroups to the user's entire
  group list as specified in the groups file (getgroups), setgroups to
  just the groups listed on the command line, plus the user...

linktest running at once (not a likely situation but ...). Also give
the window a meaningful title so that the browser does not stick in
the URL path.

buffering so that it will start to display output line by line.
1024 for Firefox, probably the same for Netscape. I hear that IE is
256 bytes.

* Changed the linktest web page to allow for killing a running
  linktest when called from the showexp page. Puts up a simple Click
  form, whose action is to call "linktest_control -k" which does the
  dirty work.

* Implement a simple frameset when running linktest. I did this cause
  it was something new and besides, it was more fun then trying to
  reverse engineer the modelnet model file. Anyway, when linktest is
  started, put up a new window that has a two window frameset. The
  right hand window is just the spew output from linktest as it runs
  (although with buffering not much turns up at first). The left side
  window has a single click box to stop the running linktest, whose
  action is to call linktest_control -k as above. By the magic of
  javascript, when the linktest finishes, the stop button is removed
  and replaced with a "Linktest Finished" message. So exciting.

in the DB, change that to Stop Linktest instead.

currently available to only people with stud=1 status in the DB.

* www/tbauth.php3: Add a STUDLY() function to check that bit.

* www/linktest.php3: New page to run linktest on the fly. The level
  defaults to the current level in the experiments table, but you can
  override that via the form on the page.

* www/showexp.php3: Add link to aforementioned page. STUDLY() only.

* www/beginexp_form.php3: Add an option (selection) to set the linktest
  level for create/swapin. Defaults to 0 (no linktest). STUDLY() only.

* www/editexp.php3: Add an option to edit the default linktest level
  for an experiment. STUDLY() only.

* tbsetup/batchexp.in and tbsetup/swapexp.in: Add code to optionally run
  the linktest, sending email if it fails (exists with non-zero status).
  Failure does not affect the swapin.