Make the VPMB-B planner pass all tests

[Rick Walsh]

With this series of patches, we now pass all VPM-B tests

[PATCH 01/10] VPM-B Tests: Output first ceiling
[PATCH 02/10] Update expected runtime of VPM-B test to match
[PATCH 03/10] VPM-B: Use correct gamma values
[PATCH 04/10] Use Schreiner water vapour pressure for VPM-B
[PATCH 05/10] VPM-B: Calculate crushing pressure on descent
[PATCH 06/10] Planner: Change where we clear deco and reset gradients
[PATCH 07/10] VPM-B: Remove obsolete first_ceiling_pressure
[PATCH 08/10] VPM-B: Round first ceiling pressure up to stop
[PATCH 09/10] VPM-B tests: correct typo
[PATCH 10/10] VPM-B Tests: Compare against known Subsurface runtime