update FGIP analysis methods; add imports to fgip runner.

phasecalculator/analysis/fgipanalysis.py

phasecalculator/runners/fgipanalysisrunner.py

phasecalculator/test/analysistest/fgipanalysistest.py

phasecalculator/test/phasecalculatortests.py

...tfiles/1-butanol0.165water0.835binding_poly_fit_split.csv

...testfiles/1-butanol0.165water0.835free_poly_fit_split.csv