Pyelmer

- Bugfix elmerkw

- Bugfix in elmerkw

- Removed solver specific keywords. For backward compatibility the new module elmerkw was added (usage: import pyelmer.elmerkw as elmer).
- Moved data to examples, it's not shipped with the package any longer.
- Updated examples

Release for pyelmer webinar.
- bugfix in Shape.bounding_box

- Merged pull request from Anil Kunwar:
- execute.py: run_elmerf90
- simulations.yml: "2D transient"
- solvers.yml: "ThermoElectricSolver"
- Improved behavior of 'import pyelmer'
- Summarized gmsh_objects and gmsh_utils to single gmsh module
- Write equation, force, initial condition, material, solver name in body / equation in sif
- renamed surf_id to geo_id in Body class
- Intoduced proper versioning numbering using versioneer
- Codestyle: black
- Bugfixes in gmsh Shape, Model
- Cleanup and minor bugfixes

- improved gmsh_objects
- added additional boundary conditions