- Fix a problem with "File Close" menu that let insight becoming unstable

- Fix a problem with "File Close" menu that let insight becoming unstable
and unable to reopen a new binary (Linux and Win32 hosts)
- Fix a problem with the source window that, once a binary is closed, is
splitted into 2 part and alway displays the old sources. (Win32 hosts only)

2008-12-16  Denis Pilat  <denis.pilat@st.com>
	on behalf of Nunzio Raciti  <nunzio.raciti@st.com>

	* library/srctextwin.itb (_clear_cache): Take care of $p variable that
	could contains ":" for source pane on windows hosts.
	* library/srcwin.itb (choose_and_update): Avoid updating the "source"
	window if target executable name is empty.