User manual: Explanations for new UI additions

[Willem Ferguson]

I am lupdating the user manual contents. There are two new additions to 
the UI that I do not understand enough to generate appropriate text.
1) The "Shearwater-like" pressure information in the Info box on the 
dive profile. Robert, please give some info in telegram style?
2) The pressure graph at the bottom of the profile. Please give a bit of 
information? One can intuitively understand the green lines, but what 
are the blue, grey and black lines?
Kind regards,
willem
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