Log Message:
Update to verilog-current-20070123

Release Note for Icarus Verilog Snapshot 20070123

Handling of arrays has been rewritten to allow support for net
arrays. This caused ivl_target API changes, as well as elaboration and
vvp run time changes. There may be bits of the old method lingering in
the source code.

Improve support for constant power (**) expressions, and other
constant exppressions that are passed to functions/tasks.

Improve elaboration of for-loop increment expressions. There were some
bugs there that are not fixed.

Fix argument width calculations for shift operations.

Constant ector expressions can have real constants. Handle this at run
time where needed.

Fix some bad lookaside optimizations for assignments to l-value part
selects.