Make "minimum data volume" a required field (default = 0)
Merge branch 'master' into 231-MDV-required
Comment following review
Merge branch '231-MDV-required' of github.com:SEEG-Oxford/ABRAID-MP into 231-MDV-required
Merge pull request #162 from SEEG-Oxford/231-MDV-required

Make "minimum data volume" a required field (default = 0)