manual edit of depth and time when adding / editing dives

[Robert Helling]

Dirk,

> On 26 Feb 2017, at 06:22, Dirk Hohndel <dirk at hohndel.org> wrote:
> 
> Please let me know what you think...

except for dereferencing a potentially NULL current_dive (see my comment on github) this looks good and safe to me.

Best
Robert
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