reficons on bpx change

enable in TilEm selecting of virtual linking
add lcdoff to screen code (Ti-86)

Not Important
-------------
 * optimise gtk_file_selection code (used several times)
 * decentralize breakpoint functions
 * optimise pixmaps
 * clean up error reporting

Problems
--------
 * Give focus back to screen when finished debugging.


Memento
-------
 * add call, jump, rst status messages

 * screen on debug
 * double click extracts address

 * Search in hex code
 * animated gif saver