Myokit

- Added data extraction features to abf format.
- Added on Fiber-Tissue simulation class.
- Various improvements and bugfixes.

- Number of cells to pace can now be set in `OpenCLCableSimulation`.
- Added function to find origin of NaN errors in an `OpenCLCableSimulation`.
- Updated SimulationLog to return mesh grid for pyplot.
- Added 1D CV calculation to `SimulationLog`.
- Renamed cable simulation classes.
- Made 1D OpenCL Simulation suitable for 2D use.
- Added method to list component cycles.
- Added a method that checks which variables cause mutually dependent components.
- Various small bugfixes.

- Fixed direction convention for diffusion current.
- Simulation log now has local and global variables (for multi-cell simulations).
- Added OpenCL export.
- Added a C header file with pacing functions, shared by several simulations.
- Added a settings file `settings.py`.
- Added OpenCL simulation object.
- Various small bugfixes.

- Various performance boosts.
- Rewrite of expression classes.
- Improved parser.
- Added options to move variables, delete variables.
- Improved `Model.clone()` method.
- Added strand simulations via Python interface.
- Various improvements and bugfixes.

- Working CUDA kernel export.

- Various small bugfixes.