update time measurements to reflect the fact that they should be arrays

time_measurements in core_profiles for density and temperature has been modified to align to the IMAS definition. A time should be given to each measurement, for each radial point, since they could have been taken from different diagnostics at different times. This is necessary as the validators routines in IMAS check for this and some functions, for example copying, do not work otherwise.

Should define: time_measurement_slice_method as well then with name='exact' or 'local' index=0 description='using Thomson scattering measurement at the given time' (if only one TS laser time was used ) or may be: name='avg' or 'average' index=-1 description='average with TS at this time and other TS within +-delta_t' (delta_t is provided in the proffit:local tree), conf should know if nodes from local or avg

requested review from @lsimons

assigned to @mmarin

approved this merge request

added 85 commits

• 88a148a6...a39c66b1 - 84 commits from branch master
• ff8d0719 - update time measurements to reflect the fact that they should be arrays....

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