make infinity larger to satisfty vesc test; vesc test
further vesc tests
flattening tests
Also use list-of-potentials routines in testing the forces of potentials
add evaluateplanarR2derivs to docs
don't cover some exceptions
evaluateplanarR2derivs on top level
use evaluate* functions for potentials, rather than Potential methods
fix doc on implementing _evaluate
Update comments on TwoPowerSphericalPotential, fixes #152
test class to test lists of potentials and MWPotential in particular, work towards #150
test with list of planarPotentials
don't cover not being able to load the integration library
further plotting testing
don't cover not being able to load the integration library
use same _INF as plotEscapecurve code