ur_obs not multiply by sin(gamma)

[Jean-Marc Delouis]

It seams that ur_obs is not multiply by sin(gamma) in the test/feature version.

[Lucile Gaultier]

the sin(gamma) has been implemented in the master version from 2018/07/19 and has been removed on 2018/09/18. Indeed after furtherdiscussion, it has been decided that we would be able to correct from this sin(gamma) assuming that gamma is well known and therefore, L2B products will be already corrected from this sin(gamma)