WGDEC-2021 QCrec: warning: Cross check of record depth with GEBCO

[Osanna123]

Extract depth (start/end) from record and compare with GEBCO dataset (would need a predefined depth tolerance – for example 10% difference). Flag (and state apparent difference) if large difference between GEBCO depth and record depth
“You have submitted a record where there is an XXX difference between water depths at the start and end of the record. Please check that you are happy with this submission.”