- fix issue where NUM_TARGETS in main() is incremented one too many times.
- plug memory leak in handle_targets() where copy of supported_targets created
to be passed to change_property() -> XChangeProperty() but not free()-ed.
XSel is a command-line program for getting and setting the contents of
the X selection. Normally this is only accessible by manually
highlighting information and pasting it with the middle mouse button.
