looks interesting
report components of hamiltonian
simplifications a la python version
asserion error if R  or THETA less than zero
log R  and THETA
experiment with clamping R and THETA minima to zero
only clamp R and THETA at start, for square root
add client
copy integrator coefficients from experimental branch
return composite error from integrator for unit testing
add another test
update t and phi separately for efficiency now, rk4 later
tidy up and relabel some tests
generate jar with dependencies
remove unnecessary intermediate update
simplify error logging
add pit testing, remove velocities from output
simplifying
try to do without asserts
add new test