DRISHTI-GS1

• DataModule and support code: data.segment.drishtigs1

• Splits:

  Config. key	Module
  drishtigs1-disc-all	config.segment.data.drishtigs1.optic_disc_all
  drishtigs1-disc-any	config.segment.data.drishtigs1.optic_disc_any
  drishtigs1-cup-all	config.segment.data.drishtigs1.optic_cup_all
  drishtigs1-cup-any	config.segment.data.drishtigs1.optic_cup_any