[PATCH] Provide photos summary on dive list

[Willem Ferguson]

Subject: [PATCH] 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 at zoology.up.ac.za>

I attach a screenshot to give an idea what it looks like at the moment.

Please, I need someone to check my coding carefully. I tested it
quite extensively and have not found any problems. Also, there may
be places where my code is inefficient.
Kind regards,
willem

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