- eventually
  - design
    - create (thud server) module
    - make (thud face) into (thud client)
    - encapsulate blk
    - clean up exception model
  - documentation
    - revise per rms input
    - improve depth and clarity
  - testing
    - hook thgen into SLED and lambda-RTL (what a great name!)
  - encapsulate sim object
  - allow blk-local definitions
    - functions
    - paramters (e.g., bit-width)
  - use keyword syntax instead of (SLOT VAL) syntax
  - clean up subsystems
    - vcd output
    - compilation
    - gschem input
    - verilog input