Icarus Verilog Snapshot 20060215

This is a fairly small change from the previous snapshot, but fixes
some bugs that have been reported. Also, it gets past working with
some of the newer Xilinx unisim models.

<ftp://ftp.icarus.com/pub/eda/verilog/snapshots/verilog-20060215.tar.gz>
<ftp://ftp.icarus.com/pub/eda/verilog/snapshots/verilog-20060215.txt>

Release Notes for Icarus Verilog Snapshot 20060215

* Part select of memory words should now work according to
Verilog-2001. This also led to some cleanup of the handling of types
internally, as well as some infrastructure for general arrays.

* Minor fix to parsing of (* *) attributes.

* Fix rounding of reals to integers.

* Clean up some of the vvp engine related to memories. Remove some
dead instructions.