Provide photos summary on dive list

1) Add an extra column to dive list, just left of Locality field.
2) For each dive, give summary of photos as follows:
   i)   no photos: no icon in that column
   ii)  photos taken during dive: show icon of fish
   iii) photos taken before/after dive: show icon of sun
   iv)  photos taken during as well as before/after dive: show
     icon with both fish and sun
3) Provide information for the sort operation to work on
   this column of the dive list.

Signed-off-by: Willem Ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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