Frederik Hennig authored 4 years ago and Markus Holzer committed 4 years ago

- Added folder 'codegen' to 'apps/tutorials'
- Implemented heat equation code generation in python
- Implemented C++ application for running the generated code
- Added CMake build files for code generation tutorial

use cuda as a first level language in CMake with `enable_language(CUDA)`
enable tests where cuda and codegen are both activated
various minor fixes

To remove code duplication the distinction is now moved
into the generator. Default kernels are "with shape".

To break unneeded dependencies in postprocessing the SQLite part is
moved to its own module and namespace.
Therefore in the include and the function calls
"postprocessing" hast to be removed or replaced by "sqlite" e.g.:
#include "postprocessing/sqlite/SQLite.h" ->
#include "sqlite/SQLite.h"

postprocessing::store... -> sqlite::store...

moved generic blockforest creation functions from pe/CreateWorld to blockforest/Initialization.h