Improve callfile documentation.
Implement peel off/peel the top/peel and trail. Fix RH single 1/4 Z.

The RH SINGLE 1/4 ZEE formation had one of the centers incorrectly
labelled as a trailer.  Fix it!

Implemented peel off, peel the top, and peel and trail from 2x2s,
zees, and some t-boned formations, w/ test suite.
Work on definitions of C4 calls from Richard Tucks 4.1 tip.
Improve `run.junit` target.

Update lists of tests, based on the output in api/tests.

Add missing @RunWith annotations to classes with doctests.

Add `AddDoctestRunner` helper to add @RunWith annotations to generated
files, and to thunk package-info.java files into something which junit
can run.
Tweak Travis configuration