picked up.

check in tides to make sure the sign of the angular velocity isn't changed

added spiral_in_time function so we can estimate the timescale of spiral
in because of angular momentum loss (also Peters' expression for
gravitational wave radiation loss: we take the minimum of the two).

added check to turn on RLOF which would be forced by a spiral in
but is not time resolved

fixed some numerical issues in the RK2, RK4 solver, and cleaned up
how evolution handles this by introducing some static sub-functions

with comenv and supernovae

this involved fixing many outstanding (but small) bugs in binary_c,
and one nasty one involving blue straggler logging (dt was used
where dtm should have been).

still need to check for memory leaks though.