Changed root_grace_t to be 1e-6 of the integration time interval. Also, don't append the last timepoint in the root_grace integration, to avoid needless duplication of intervals.
Changed root_grace_t to be 1e-6 of the integration time interval. Also,
don't append the last timepoint in the root_grace integration, to avoid needless
duplication of intervals.

GutenkunstLab/SloppyCell,GutenkunstLab/SloppyCell