[PATCH] Rebreather branch. Start of branch

[Willem Ferguson]

I hope this is good as a first patch!

Changes to sample data structure:
This patch implements changes to the structure of the sample structure
by using more strict typing. In units.h, creating two new typedefs:
         o2pressure_t
         bearing_t
In units.h, changing the types of the unit variables to int32_t or int16_t.
This was for duration_t, depth_t, pressure_t, temperature_t.

Changing the types of the sample structure in dive.h so that all 
variables are
strongly typed and that all variables are defined in term of units. This 
included:
In dive.h, add the following variables to store rebreather data later on:
         o2setpoint
         o2sensor[3]
         Change cylinderpressure to cylinderpressure[2] to povide for 
diluent

Changes to the files below involved changing sample->po2 to sample->po2.mbar
and changing sample->cylinderpressure to sample->cylinderpressure[0]

Signed-off-by: Willem Ferguson <willemferguson at zoology.up.ac.za>

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