If we need anything from these files, we can re-add it later.

Initialize all wires, output ports, and instance input ports to 0.

The damn JVM isn't deterministic.

It wasn't correctly implemented, anyway.

- Check that ground types match
- Emit FIRRTL bulk-connect instead of := for bundle connections

This commit institutes a more structured system for managing namespaces.
It fixes a handful of namespace collision bugs, and also improves
performance by abandoning ungainly string-based IDs.

The concrete return type was the type of the LHS, which is wrong for
most mixed-signedness code.  We can get it right using double-dispatch,
but let's wait until we know we need to do so.

I left the comparison operators because their return type is always Bool.

We must compensate for Class.getMethod's nondeterministic ordering.

For Vec and Bundle, toBits and fromBits got the flattening order wrong
and so weren't inverses of each other.