Fix observation fields
Fix observation fields:
- InsMode: fix reported missing PIONIER ins modes (see https://gricad-gitlab.univ-grenoble-alpes.fr/OSUG/JMMC/jmmc-obsportal-analysis/blob/master/obsdb/invalid_insmode_sorted.log)
- Exposure time: ExpTime => use keywords DIT + NDIT => ExpTime (second) = DIT * NDIT => fix mjd_end computation
- mjd_end = mjd_start + correct exp_time
- store time_start / time_end as UTC ?
- valid = true / false (see coming validation rules)
Edited by Laurent Bourgès