Closes #2

Removes the forced `int` for `fmin` in MFD. As noted by David, this
isn't required.

pyfstat/core.py

@@ -1094,7 +1094,7 @@ transientTauDays={:1.3f}\n""")
         else:
             data_duration = self.maxStartTime - self.minStartTime
             cl_mfd.append('--duration={}'.format(int(data_duration)))
-        cl_mfd.append('--fmin={}'.format(int(self.fmin)))
+        cl_mfd.append('--fmin={}'.format(self.fmin))
         cl_mfd.append('--Band={}'.format(self.Band))
         cl_mfd.append('--Tsft={}'.format(self.Tsft))
         if self.h0 != 0: