* digittoint not standard on linux
* Use neuron.test() instead of rxd specific test.
* update submodules : iv as well as coreneuron (#302)
* Array for spike compression may not be allocated in some circumstances. (#293)
* Remove legacy options for purify and mpitrace library of bg-q (#296)
* Avoid bash warning/error for empty if block (#298)
* add back the run_all.py travis_cl test
* Reviewed all assert for necessary side effects. (#306) (#307)
  30 converted from assert to nrn_assert. So work properly with NDEBUG
  defined.

Co-authored-by: Pramod Kumbhar <pramod.kumbhar@epfl.ch>
Co-authored-by: Michael Hines <michael.hines@yale.edu>