Calculate VPM-B ceiling outside of planner

Doing VPM-B calculations for dives outside of the planner has not been
possible because real dive data does not record either:
	- reference pressure for the Boyle's law compensation (i.e.
first_stop_pressure), or
	- deco_time for the vpmb_next_gradient function used to do the CVA
calculations

However, we can infer these values to be:
	- first_stop_pressure is the deepest ceiling in the dive
	- deco_time is dive time from the deepest ceiling until the
	  ceiling clears (or would have cleared if the diver finished
	  their deco obligations)

With these assumptions, the CVA converges rapidly.

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Robert C. Helling <helling@atdotde.de>

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