Update copyright year
Implement the ghost annotation feature

* src/matann/annotation_gui.m (annotation_gui_OpeningFcn): Initialize the
needed variables.
(select_offset_from_list): Add logic to create exact replica of current
annotation in the new annotation file.
(gcb_Callback): The callback for the new checkbox.
* src/matann/annotation_gui.fig : Add checkbox to the layout.