PATCH for Ticket #445 (Adding units to mean depth value)

[Gopichand Paturi]

Hello All,
I am sending the patch for the ticket #445
 i.e  Adding units to mean depth value under Mean depth line of the dive
profile.

I did this by enabling the bool value to true for get_depth_string()
function.
Please let me know if there is any feedback.

Thanks&Regards,
Gopichand.
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