Any default configuration settings can be included within read_config DEFAULT_CONFIG. If setting not defined in config, it will be added from there.

Any default configuration settings can be included within read_config DEFAULT_CONFIG. If setting not defined in config, it will be added from there.

…r-pa/oac into feature/default-co2-rf-method

Update TestCheckConfig. Add TestGetKeysValues, TestAddDefaultConfig

Update of example.toml, CONFIG_TEMPLATE in read_config.py and tests/read_config_test.py
Update of openairclim.rst for automatic generation of API doc for module calc_cont.py