1- Added two variables to call to dialog_menu() to save the position 
2  in the menu when choosing a menu-option.
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4- Added dialog_fselect(), implements a fileselector dialog
5- Added ui-interface objects: Stringobject, Listobject and Buttonobject.
6  The fileselector dialog was built using these objects.
7- changed dialog_menu to use PGUP and PGDN
8- Added dialog_mesgbox, which display text given in a char buffer.
9- 
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