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Taylor f2ecc waveform: a new eccentric TaylorF2Ecc waveform approximant

HyungWon Lee requested to merge hyungwon.lee/lalsuite:taylorF2ecc_waveform into master

We have developed/implemented an eccentric TaylorF2 waveform. This merge request introduce a new approximant "TaylorF2Ecc" as an eccentric TaylorF2 waveform for low eccentricity. The key change for this waveform is that it gives the phase correction up to 3PN order with small(~0.2) eccentricity at a reference frequency( e.g. 10Hz) for existing TaylorF2 waveform. All other parameters like spin is treated exactly the same as the latest TaylorF2 waveform. More detail explanation will be found in https://dcc.ligo.org/LIGO-G1801937

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