- precompute log(0.99) and log(0.01)

- refs #2229

- port code to functions in lalsimuation.  also change the padding formula
  from 1.1 * tchirp + 1 to 1.1 * tchirp + 3/flow.
- even with the original padding formula the results are slightly
  different.  e.g., with the ER7 "em bright" bank and an f low of 10 Hz,
  the old implementation determined the padding to be 175.7 s with a padded
  f flow of 9.647 Hz, while the same formula implemented with the
  lalsimulation functions determines the padding to be 179.8 s with a
  padded f low of 9.583 Hz.
- this also adds some input checking to avoid getting weird error messages
  from this code
- refs #2179

Change in functionality of gstlal_compute_strain as a full or partial calibrator.  Remove support for whitening functionality.

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Comment out action items elsewhere
Create a study page for the impulse response test

- now that LAL is built with pthread locking enabled, and we require it to
  be in the configure script, we can remove what is now redundant fftw
  wisdom protection.  this should enable multi-threaded injection
  generation.
- see PR2228

- was providing hooks for accessing wisdom locking, but no longer required
  because LAL is built with locking enabled

- see PR2220

- see PR2218