Align ok and cancel buttons to the right

[feerrenrut]

Typically in windows the ok / cancel buttons are on the right of the dialog. While I dont think this matters a great deal, its nice to be consistent. I think it also helps to show that the buttons relate to the dialog rather than being part of the dialog content.

When implementing this in #6189 I found that the buttons didn't cope with the resizable dialog very well when aligned to the right, this may be a limitation of the wx framework.
Try putting the buttons in a panel first, see http://zetcode.com/gui/wxwidgets/layoutmanagement/

[feerrenrut]

Feedback on GUI, received via email.

The OK/Cancel buttons are nicely spaced between each other and padded well from the left and bottom edge of the dialog, but they are very close to the other options on the dialog. they need to be moved down a bit away from the options above them. They should also be right-aligned on the dialog. It is correct to have OK to the left of Cancel, but in layout terms, most dialogs in Windows have these two buttons right-aligned in the dialog overall (still padded from the edge of the dialog but certainly right aligned).

This spacing issue might appear on other dialogs as well. I will comment as appropriate when/if it comes up.

[feerrenrut]

Feedback on GUI, received via email.

The OK/Cancel buttons are nicely spaced between each other and padded well from the left and bottom edge of the dialog, but they are very close to the other options on the dialog. they need to be moved down a bit away from the options above them. They should also be right-aligned on the dialog. It is correct to have OK to the left of Cancel, but in layout terms, most dialogs in Windows have these two buttons right-aligned in the dialog overall (still padded from the edge of the dialog but certainly right aligned).

This spacing issue might appear on other dialogs as well. I will comment as appropriate when/if it comes up.