headerbar: Fix item positions

https://bugzilla.gnome.org/show_bug.cgi?id=721739
headerbar: use the old order when compiled with gtk+ 3.10
preferences: fixed url to extensions page
headerbar: fixed buttons order with gtk+ 3.11
preferences: hide the file properties by default
preferences: use the high quality zoom by default
updated for version 3.3.1
Cannot Save As with uppercase .JPG

[bug #721281]
Fix build failing without libtiff installed.

https://bugzilla.gnome.org/show_bug.cgi?id=722183
fixed a function call
Use unity-control-center if in Unity

https://bugzilla.gnome.org/show_bug.cgi?id=722233
Remove unnecessary gdkx.h include from gth-screensaver.

https://bugzilla.gnome.org/show_bug.cgi?id=597594
removed use of libegg
gthumb doesn't honour privacy settings

[bug #722349]
set G_APPLICATION_HANDLES_COMMAND_LINE for the application
do not load the history if remember-recent-files is false
Updated Greek translation