Corrected the mess caused by introducing default_nettype none into the design
verification netlists.  Also cleaned up the broken power-on-reset signaling,
and added connections from the user space to the I/O pad direct-to-pad analog
signal pins.
diff --git a/verilog/rtl/gpio_wb.v b/verilog/rtl/gpio_wb.v
index 77d1f3a..70bf65e 100644
--- a/verilog/rtl/gpio_wb.v
+++ b/verilog/rtl/gpio_wb.v
@@ -138,3 +138,4 @@
     end
 
 endmodule
+`default_nettype wire