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The biggest changes were related to 10.0's replacing gcc with clang
and the switch to a new package system. The former required various
fixes to Makefiles that hardwired "gcc" and also missing prototypes
in source files that clang is particularly obnoxious about.

There was also accomodating the normal evolution of the ports tree.
New variables were needed in many of the Makefiles for this. Hopefully,
all the changes I made are backward compatible, but I don't actually
care that much since I hope to never, ever have to remake those older
packages! A new emulab version of the m2crypto port was needed to
reflect that m2crypto is no longer installed as an .egg file.

Casualties:

  * Emulab assign. As of this commit, assign does not build with
    clang. It will build, but immediately core dumps if built with
    a gcc port (gcc46 below). THIS NEEDS TO BE FIXED!

  * Emulab nsverify. This requires building a pure ns-2.34, which
    is old and does not compile with clang. You will need to set
    NSVERIFY=0 in your defs file. I did this in defs-elabinelab
    (iff FBSD==10) but no where else right now.

  * Bind in the base distro. Bind is no longer part of FreeBSD
    (it has been replaced with something called "unbound"). So we
    install bind99 from a port and we make the /etc/namedb symlink
    to /usr/local/etc/namedb which is where it now lives.

  * Perl 5.12. It has been totally removed from the ports tree.
    We now install 5.14, the next-most obsolete version of Perl!

  * pkg_{add,delete,info}. As mentioned, the packages tools have
    changed. For the most part "pkg <cmd>" is the same as "pkg_<cmd>"
    but not always. This required considerable violence in the
    install/phases code. But it is actually cleaner now.

  * GCC in the base distro. I added installation of the gcc46 port
    to the boss and ops meta packages, just for old-times sake
    (we might wind up needing it, if still more stuff doesn't work
    with clang).

a XEN based ElabInElab with boss and ops running firewall rules based
on the ruleset we use on Utah's firewall. To turn this on, add this to
your NS file:

tb-set-elabinelab-attribute CONFIG_FIREWALL_BOSS "yep"
tb-set-elabinelab-attribute CONFIG_FIREWALL_OPS  "yep"

You do not have define both.

* Split up boss/ops/fs install into indvidual modules; generally, what
  was a toplevel phase in the original files is not a file. This
  allowed for better code/variable reuse. No longer monolithic, which
  makes it easy to test and rerun parts.

* Incorporate "update" into the install process. Certain phase file
  can be used in update mode, as when the IP/subnet/domain changes.

* Moved the MFS setup from rc.mkelab into the normal install process.
  Users no longer have to do this themselves. Good thing.

* installvars.pm is a new library that has the merged set of the
  zillion variables that were at the top of boss/fs/ops install.