Add --omp-nest option to the copy application. May be needed when testing different threading models.

Sync with the internal SLB repository. More devops.

See merge request !58

Several unrelated minor changes.

See merge request !57

Remove OpenZGY builds for Ubuntu Xenial and Debian Stretch. The alternative would be to upgrade to a new python (as Python 3.6 is end of life) but I doubt anybody is using those distros any longer.

More multi-threading

See merge request !56

Honor "iothreads" when reading from seismic store, allowing OpenZGY to do more parallelizing internally.

More consistency checks when a ZGY file is opened.

See merge request !55

Allow reading version 1 ZGY files.

See merge request !54

filestats() changed to return a smart pointer.

See merge request !53

Some minor canges to the build scripts.

See merge request !52