Added polDebias() function, and edited polCalc_FITS to include it.  Took sigma_pol out of polCalc_FITS input list.
This is now basically defunct; this function has been implemented in polDebias() in functions.py.
Changed name of FIR4 to FIR3/4.
These changes come after implementing polDebias() in polCalc_FITS().  I took sigma_pol out of polCalc_FITS() function call.  Replaced np.max with np.nanmax.  Added cutoff to CARMA vector plotting right at the end.  Added else: statement to plot bolo vectors without sqrt scaling.  Removed commented-out code to find stdev of mean of pol frac.