update version number and init message
enable zhang-li PBC + test file
slonczewski cleanup
split JPol in J and Pol [backwards incompatible change]
engine: expose slonczewski parameters
add standardproblem5a
engine: enable slonczewski. TODO: decide if zhang-li is on
fix input param initial timestamp = -inf
allow for region-wise time-dependent parameters.
need more accurate const test
mark random functions as pure to avoid being treated as time-dependent
cleanup scalar param
fix time-dependent region-wise excitation (Thanks Robert Stamps)
timedep excitation extra test file and fix
version 3.3-beta1