Dive list: switch to a default sort order on column-header click

On desktop, clicking on a column header sorts the dive-list. This
has the interesting property that every click reverses the sort
order (unless changing from list to tree-mode). The much more
common idiom seems to be to define a default sort order for each
column and switch to that when changing sort-column. Switch order
after clicking the same column again.

Implement this more common behavior. For now, sort # and date
in descending, all other columns in ascending order.

While doing this, use the proper enum (NR) for setting the default
sort-column instead of its integer representation (0).

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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