lal_transferfunction:  Made fir filter length independent of fft length. Added ability to resample and low-pass filter transfer functions to produce fir filters. Reduces noise in transfer functions wieh multiple witness channels are equally well correlated with the signal to be cleaned.

lal_transferfunction:  allow any length of fir filters by resampling the transfer functions. Reduce noise by low-pass filtering transfer functions.

lal_transferfunction:  Only update transfer functions and FIR filters if they were computed successfully.

audioresample_test.py:  simple pipeline to compute the transfer function associated with downsampling and upsampling data with audioresample

lal_transferfunction:  if transfer function of fir filter generation fails for any reason, immediately try again.

gstlal_compute_strain:  added option to remove DC component from residual and control channels before filtering.

lal_resample:  found downsampling bug that counts samples incorrectly when the first timestanp is not a multiple of the longer sampling period

lal_transferfunction:  numerous fixes to fir filter generation.  calibration_parts.py:  data cleaning function

gstlal-calibration:  new element lal_transferfunction to compute transfer functions between 2 or more channels in real time.