Changes in 3.5.5

* Fix various layout bugs from previous changes (Sébastien Granjoux)
* Remove public members in structs (Sébastien Granjoux)
* Deprecate macros and replace them with access functions (+ adding some new access functions for now private members) (Sébastien Granjoux)
* Fix bgo #667158 - Constructor for GdlDockBar loses 'dock' argument with gobj (Sébastien Granjoux)
* Fix bgo #680655 - test-dock crashes (Sébastien Granjoux)