* NEW: Add a new GB.Component.Declare() API, that allows a component to
  dynamically register a class description.

[INFORMER]
* NEW: A component now can declare classes through a GB_OPTIONAL_CLASSES 
  public symbol. Theses classes are included into the information file,
  but are not automatically loaded as the ones defined through the 
  GB_CLASSES symbol.

[GB.FORM.STATUSICON]
* NEW: This component has been removed and replaced by gb.dbus.trayicon.
* NEW: This component now provide TrayIcon and TrayIcons classes that have
  exactly the same interface as the old ones.

[GB.DBUS]
* NEW: Remove the now useless DBusConnection.Raise(). The DBusConnection
  Register() and Unregister() are kept for backward-compatibility reason.
* NEW: Add DBus.Raise() and DBus[].Raise() to raise signals. At the moment,
  there is no difference between the two methods, as there no mean to
  indicate the sender raising a signal. I don't know yet how DBus decides
  which service sends a signal!

[GB.DBUS.TRAYICON...