GitLab

The file is now part of 'dorie create'

* Move definition of ScalingFactors into new file
* Add interface for ScaleAdapter
* Add implementation for Miller and Dummy scaling adapters
* Add factory for creating scaling adapters
* Add generic input of global scaling fields to FlowParameters

* Add standard YAML file with parameters for sand and silt.
* Modify create_param_maps.py for creating an H5 datafile with maps
    for tests.
* Add a new target 'prepare_testing' for creating the H5 datafile
    before running system or unit tests. It is a dependency of
    'system_tests' and 'unit_tests' (but not 'test').
* Add gitignore exception for H5 datafile.
* Remove creation of H5 datafile from GitLab CI config.