Current direction (THETAC) and wave direction (THETAW)

This issue was created automatically from an original CUE issue. Further discussion may take place here.

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These variables should be keep the same unit and convention all the time in GAIA: computed in degree and with respect to the X axis.
They can be locally converted in radians if necessary.
If there is coupling with Tomawac, the direction convention can be taken into account thanks to the variable TRIGO.

This improvement has been proposed by R.Walther (ARTELIA).