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/digital_pll.v b/verilog/rtl/digital_pll.v
index dac708a..2f3fc2a 100644
--- a/verilog/rtl/digital_pll.v
+++ b/verilog/rtl/digital_pll.v
@@ -53,3 +53,4 @@
     );
 
 endmodule
+`default_nettype wire