updates 2001.03.25

Folks, I've done the usual check-in-piles-of-stuff thing;
new FTP snapshots available; Web pages updated...

Highlights (and lowlights):

* [USER-VISIBLE CHANGE] - I fixed an infelicity in the
  ARK1->2 conversion whereby <proxy-hosts> and
  <packages-install-dir> became <list>s, not <table>s.
  They are now <table>s.

  Matt, if you 'cvs update -d -P <everything>', they
  should be fixed.

  (Technically, this change should make xml-version=...
  change.  I don't think we have enough users to justify
  using the bureaucracy yet.)

* [USER-VISIBLE CHANGE] - The --invalidate-node*
  command-line options have been renamed --undo-state-from
  and --undo-state-pattern.  The old names were nonsensical
  in an ARK2 world.

* I added great swathes to
  http://ark.sourceforge.net/ark-conflang.html, notably
  annotations of a team's team.xml, host/ALL.xml, and
  package/ALL.xml.  Tidying needed; but Harlan, I hope this
  answers some of your "what's a proxy-host?"-type
  questions.

* I added the --constraint-hosts flag, as mentioned here.
  Not tested enough to have any confidence at all about it.

* Renamed Jonathan's TemplateParser.py to ark/template.py.
  I have vague plans to make it an oft-reached-for ARK
  tool.

* Combined ark/cmdline.py and ark/profile.py into
  ark/control.py.  This module does "global program
  control", and handles (um, will handle) .ark-profile
  files, environment variables, and command-line flags in a
  consistent way.  I think Harlan was the first to suggest
  this.

* I am trying to teach myself a little about XP-style
  "test-first design", partly be retrofitting stuff to the
  ARK framework (ARK/arkbase/ark/).  Using PyUnit.  The
  *tests.py modules in that dir, plus the tests/ dir for
  test data.

  If anybody wants to wade in and write some more of these
  tests, let me know.  I've found it *quite* instructive so
  far.  I can really see how this could make the ARK
  framework Totally Bulletproof.  Which would be... nice.

* It passed the "sample1 try-ark" test when I ran it
  yesterday.

Let me know of any problems.

Will