New way of organizing pages :
PageStack, then tabs.
New flags from WikimediaCommons.
Test of package generation.
UI modifications :
- remove of 'search' buttons : they are unnecessary
- buttons with flags are bigger (they are built through a special component)
Moved the 'switch' button in the toolbar.
New icon for 'switch' button.
Creation of click package.
Deleted unused png file.
Cleaned pref panel.
Added application icon.
Handling of focus pb when mayout change. Done through a workaround because the real 'onLayoutChange()' notification is not available.
Added a 'about' page. Added the checkFocus for every pageStack change, not only for layout change.