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The toolchain build should be dependent on an actual file to ensure we
don't rebuilt it for every target that goes into the initramfs.

Also rename old fake tcsh to tcsh.fake, and run a new script that
symlinks tcsh and csh to tcsh.fake if tcsh doesn't exist.  This way tcsh
can be removed from the build but tcsh/csh users can still log in.

or more then one experiment, of course.

commit.

use when (re)loading a node.

<disk_image
   name="urn:publicid:IDN+emulab.net+image+GeniSlices//UBUNTU91-LAMP" />

In other words, allow "GeniSlices" for the project, so we can add
images to be used from the rspec.

Use 'git diff-tree --no-commit-id --cc' on merge commits to determine if
there are any differences between the merge commit and its parents.
This is the case if any new files were hand-modified or added as part of
the merge (such as when conflicts were resolved).  If git-diff-tree
produces no output, the merge was trivial.

If the merge was trivial, the commit message is checked for an empty
body.  If empty, the commit is skipped when generating the email.  This
way if the committer documents the merge in some way (list of changes,
reason for the merge, etc.) the email includes that information.

impotent, except that actually nalloc the nodes, and retry if the
nodes are sucked up by someone else inthe meantime.

Also, in the CM, add better ssh key checking.

added to pubs.html.

Resolve the slice/sliver credential and use that.

tuntest.py now takes three optional rspec files (examples are gec8*), one for each side of the tunnel and one providing the tunnel glue.

Now, if experimenters add users or groups to their nodes, and take
an image, they must explicitly tell prepare to overwrite the master
passwd/group/shadow files in /etc/emulab.  For Linux,
os_account_cleanup tried to update the masters automatically, but
this is not fullproof and can result in the masters getting passwd
hashes from shadow.  Now, a diff of the non-shadow files is printed
from prepare so that at least people can see that the masters need
to be manually updated.