STYLE : Add headers to python scripts

python_src/diapotb/ConfigFile.py

python_src/diapotb/SAR_MultiSlc.py

python_src/diapotb/SAR_MultiSlc_IW.py

python_src/diapotb/__init__.py

python_src/diapotb/diapOTB.py

python_src/diapotb/diapOTB_S1IW.py

python_src/diapotb/lib/DInSAR.py

python_src/diapotb/lib/DiapOTBProcessingFactory.py

python_src/diapotb/lib/Ground.py

python_src/diapotb/lib/PostProcessing.py

python_src/diapotb/lib/PreProcessing.py

python_src/diapotb/lib/__init__.py

python_src/diapotb/lib/core/ApplicationWrapper.py

python_src/diapotb/lib/core/DiapOTBEnums.py

python_src/diapotb/lib/core/DiapOTBExceptions.py

python_src/diapotb/lib/core/DiapOTBProcessing.py

python_src/diapotb/lib/core/Utils.py

python_src/diapotb/lib/core/__init__.py

python_src/diapotb/lib/internal_processing/__init__.py

python_src/diapotb/lib/internal_processing/core/__init__.py