Instead of 'opyc dis' taking an optional report_path, we now have 'opyc
dis-tables', which outputs 5 tables related to Python's
types.CodeObject:

- frames
- names
- consts
- ops
- flags

Some ad hoc analysis in R already produced some interesting results,
e.g. how big the instructions are (~216 KB) vs. all the .pyc files
(~918K).  The rests is constants, metadata, .pyc headers, etc.

Also: Make an intermediate file _build/oil/all-deps-py.txt.  Right now
we're counting the lines with it, but it make it easier to do metrics in
general.  (e.g. compilation time)