Merge pull request AcademySoftwareFoundation#922 from danrbailey/8_0_…

…0_release

OpenVDB 8.0.0 Release

OVDB-150: Bump version to 7.2.1

Signed-off-by: Dan Bailey <danbailey@ilm.com>

Merge pull request AcademySoftwareFoundation#896 from Idclip/release_…

…7.2.0

Release 7.2.0 (OVDB-149)

Merge pull request AcademySoftwareFoundation#780 from danrbailey/doxy…

…gen7_1_0

OVDB-148: Update doxygen project number to 7.1.0

Added macOS Catalina to platform.mk.

Merge pull request AcademySoftwareFoundation#580 from Idclip/7.0.0_re…

…leasecandidate

[OVDB-132] Release 7.0.0

Merge pull request AcademySoftwareFoundation#522 from danrbailey/OVDB…

…-120

OVDB-120: OpenVDB 6.2.1 release

Merge pull request AcademySoftwareFoundation#516 from pcucka/OVDB-113

OVDB-113: OpenVDB 6.2.0 release

Merge pull request AcademySoftwareFoundation#413 from pcucka/OVDB-82

Improve interruptability of the MeshToVolume by adding interruptor

checks.   Gate this for every 1024^2 iterations as the interruptor
still has a bit of overhead.

Signed-off-by: jlait <jlait@andorra.sidefx.com>