add background hinting in koptinterface
disable hinting temporarily in config dialog and flipping mode and cropping dialog
Since hinting is of little use in these situations.
dismiss chrome bar before launching the reader
Merge pull request #787 from chrox/background_hint

add background hinting in koptinterface
Merge pull request #789 from chrox/new_ui_code

dismiss chrome bar before launching the reader
listen home key press in filechooser
Merge pull request #790 from houqp/new_ui_fix

listen home key press in filechooser
rearranged source tree