Rename PVH_KB_NKI_IVIMfit.py to PvH_KB_NKI_IVIMfit.py

Author: IvanARashid

src/standardized/PVH_KB_NKI_IVIMfit.py renamed to src/standardized/PvH_KB_NKI_IVIMfit.py

@@ -59,4 +59,4 @@ def ivim_fit(self, signals, bvalues=None):
         f = fit_results[1][0,0,0]
         Dstar = fit_results[2][0,0,0]/1000
 
-        return f, Dstar, D
+        return f, Dstar, D