Interpolation: less strict assertions
Curve::getValueAt() and Curve::getDerivativeAt(): use std::set::upper bound (I don’t understand why it wasn’t used)
Curve::getValueAt(), Curve::getDerivativeAt(): factorize code
Curve::getIntegrateFromTo((): implement
Knob::getIntegrateFromTimeToTime(): implement
OfxParamInstance: add support for integrate on animated parameters
update GitVersion.h