Microbenthos

Changed domain variable seeding to follow statistical distributions with easier scaling
Fixed dataview for irradiance metadata (bugfix)
Allows 0 residual during calculations (bugfix)

Minor bugfixes for CLI level use

v0.13-release
Since the core dependency of fipy is now usable directly in python3, microbenthos is now considered python3-only software (> python 3.6)

Time-stepping heuristics were improved to deal with numerical instabilities for stiff differential equations. API remains unchanged, though there are behavioral changes in running Simulation.run_timestep and Simulation.evolution.

Other small improvements in the submodules.

Peer-reviewed and approved version of microbenthos for Journal of Open Source Software