We can test +ob exhaustively over a smaller input space; if it behaves
correctly, that gives us much greater assurance that the implementation
is correct for the full planet space.
Added support to `lens-command` for outputting a pill. We want this so that we can create (solid and brass) pills from `urb.py`.
This also adds an optimized base64 encoding routine. The previous version of base64 stack overflowed on large inputs, and a tail-recursive version took hours to encode 5mb of data. This one uses the `ripn` jet and only takes a second or two.
