Adds functionality to specify individual priors on glitch magnitudes

- This requires more verbose input for all mulitple glitch searches (in
  the case that the prior is the same it will need to be repeated), but
  ultimately leads to greater flexibility.

pyfstat.py

@@ -1338,6 +1338,10 @@ _        sftfilepath: str
         if 'tglitch_0' in self.theta_prior:
             full_glitch_keys[-self.nglitch:] = [
                 'tglitch_{}'.format(i) for i in range(self.nglitch)]
+            full_glitch_keys[-2*self.nglitch:-1*self.nglitch] = [
+                'delta_F1_{}'.format(i) for i in range(self.nglitch)]
+            full_glitch_keys[-4*self.nglitch:-2*self.nglitch] = [
+                'delta_F0_{}'.format(i) for i in range(self.nglitch)]
         full_theta_keys = ['F0', 'F1', 'F2', 'Alpha', 'Delta']+full_glitch_keys
         full_theta_keys_copy = copy.copy(full_theta_keys)