permute arguments to noise_calc, for consistency with all other functions

All noise calculation functions in pygwinc take the arguments (freq, ifo)
in that order.  It's annoying that for some reason this one is different.

gwinc/gwinc.py

@@ -9,7 +9,7 @@ from . import noise
 from .plot import plot_noise
 
 
-def noise_calc(ifo, f):
+def noise_calc(f, ifo):
     """Calculate all IFO noises and return as dict
 
     Assumes ifo has already been run through precompIFO().
@@ -105,7 +105,7 @@ def gwinc(freq, ifoin, source=None, plot=False, PRfixed=True):
         pass
         #warning(['Thermal lensing limits input power to ' num2str(pbs/prfactor, 3) ' W']);
 
-    noises = noise_calc(ifo, freq)
+    noises = noise_calc(freq, ifo)
 
     #TODO decide if all this below this should remain, since it is already inside of __main__