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allow to exit from fullscreen using the 'f' key
allow to rotate images with '[' and ']'

space to view the next image, backspace to view the previous image

When a sidebar is on the right side, it's hard to set its width
correctly.  Use a fixed size for now.

added map/unmap to the gth-image-viewer-tool interface

Also, renamed "Date" to "Comment Date", to distinguish it from the
file mtime, or various exif date tags.

added push/slide from bottom, cube

simplified the code as well

[bug #593911]

no need to reload a folder, just compute the required attributes
before loading

[bug #593833]

reset textures position at start of the animation

scan the viewer pages in reverse order in order to give to the
image viewer an higher priority than the generic file viewer.

added a tab in the preferences dialog to configure the slideshow;
make the transition system extensible.

use the first source available if no source is specified
[bug #593694]

[bug #593684]