add init files for expected structure.

phasecalculator/analysis/__init__.py

phasecalculator/io/__init__.py

phasecalculator/runners/__init__.py

phasecalculator/test/__init__.py

phasecalculator/test/analysistest/__init__.py

phasecalculator/test/iotest/__init__.py

phasecalculator/test/runnerstest/__init__.py