Improvements for UI

Hi

after having used Simple Scan for some time to scan a few photos I might propose a few improvements for the UI:

1. Ctrl+S overwrites the default name of a doc even if it exists without an "overwrite?" dialog. This is outright dangerous because you might loose a document. Please add an "overwrite?" dialog.

2. The resolution is hidden under the scan button. So if it happens to be "text" and you press "scan" you get a low resolution image. Better to have 2 buttons "scan foto" and "scan text" so you know what you are doing.

3. A keyboard shortcut exists for new document (ctrl+n) but no keyboard shortcut for "scan". So you cannot rely on keyboard alone for the next scan. Please add a (better 2 see N°2) shortcut for scanning.

4. Trunk (? maybe that is not the correct translation, in German it says "Zuschneiden") starts always with a standard frame size. So if you happen to have a few pages with the same layout size, you must adapt the size manually all the time. Better to remember the last frame size used.

Thanks for the great piece of software anyway.

Regards
Matthias