v1.6

Features

• Gitlab CI pipeline
• tracking of passive parallel regions
• tsan annotations for mutex synchronization in the reverse pass
• postEvaluate() method in the logic interface

Fixes

• build flags in the test system for producing reference files
• memory leaks
  • in the OPDI_SINGLE macro
  • in tests for external functions
  • clearing the tape pool

Chore

• update links