-There are now two approximants:
    NRSur7dq2_HM uses all modes available (ell <= 4)
    NRSur7dq2_L2only uses only the (2, +/-2) modes in the co-orbital frame
-Use lalsimulation lalinference_o2 conventions in ChooseTDWaveform
 As there is not a consistent convention, we follow SEOBNRv3.
-Fix various issues with GPS time, fmin, fref
-Add StartFrequency function giving smallest allowed fmin and fref
-Add documentation
-Fix small numeric error in waveform evaluation