disambiguate from boost's random() function. But, for some reason,
with 3.x, random() doesn't live in the std:: namespace. Macro-ize it.

This mostly required messing with the STL #includes.

Still builds under gcc 2.95, and won't be built with 3.3 by default
until I've spent more time testing it.

One reason for doing this is that gcc 3.3 seems to generate faster
code from templated functions. Tests so far show that the
gcc3-compiled binary shaves 15-30% off of assign's runtime.

The other reason for doing this is forward-looking. When we end up
getting boss running on FreeBSD 5 or a recent Linux distro, the
compiler is likely to be from the gcc 3 branch.

using the new assign, and captures Leigh's linkdelays work.

time to debug a delayed LAN problem.

In addition to assign, assign_wrapper and ptopgen have been modified
to output the new formats used by assign.

make-vclass A 0.5 pc600 pc850

in the top file.  And then have nodes of type A.  Assign will try to put
them all as either pc600 or pc850.

Still need to write all the pre-assign stuff.