Fix compile error

I get compile errors from these lines. Removing the class name from the
calls allow me to compile the current master.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Use DateTimeOriginal on image import

Some digital cameras do not set the DateTime exif field bat use
DateTimeOriginal. If the first option is not found, use the second one
to try to detect the moment when the image was shot.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
User manual: Style and grammar updates

This is an edit for style and grammar for the manual section dealing with
downloads from DC. This section has also been expanded to cover all the
controls in the downloads panel.

Signed-off-by: Willem Ferguson <willem@willem-Precision-M4700.(none)>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Updated the included user-manual.html

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Make lastUsedImageDir static to prevent a crash

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>