knora-base:IntervalValue: Enforce end higher than start

[tobiasschweizer]

Should Knora enforce that the end of an interval is higher than its start?

See also dasch-swiss/dsp-ui-lib#26 (comment)

[SepidehAlassi]

Yes, the end of an interval should be higher than its start. I will add a check for that in DSP-1766.