add shortcut for "next photo" and "previous photo"

[Cobra]

It would be nice to have some shortcut to switch photos in agpifoj. This would speed up the work flow a bit and add a lot of comfort (at least for me).

I suggest using 'n' (at the moment this does the same as 'a' but isn't documented in the tooltip) or 'shift-n' for the next and 'p' (or 'shift-p') for the previous one.

[bastiK]

(In [2601]) fixed #3722 - add shortcut for "next photo" and "previous photo" (PG-UP and PG-DOWN)
Some components consume these shortcuts if focused. This can be resolved on an individual basis if it is a problem for certain work flows.

[anonymous]

I added PAGE-UP and PAGE-DOWN as new shortcuts. So now would be the right moment to intercept, if you think these keys should do something different!

[AM909]

In r3786, if you select an object, then double-click on a value in the Properties window, edit the value, save it by pressing <ENTER>, and then press <PG-UP> or <PG-DN>, they do not change the active picture in the imagery window. As this is a very common task, I find myself very often having to click on the main or imagery window to make the imagery shortcuts work again.