Log Message:
update to snapshot "20030705".
There was a couple of snapshots since february; besides bugfixes the
major highligths might be:
-handling of real values at various places
-support for library modules (esp cadence PLI1)
-better FPGA support (esp Virtex II)
-"vvp" interactive mode added

Also converted to buildlink2, and dependencies to libz, libbz2 and
readline added.