When adding a dive site, enter the name field of the new dive site.
Thus, when adding a new dive site, the user can immediately edit the
name.
The code is rather subtle: It hooks into the dive site added signal
before executing the command and unhooks afterwards. This only works,
because signals are executed in order of connect - thus the model
adds the index first and only *then* is the field edited.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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