Swapping the position of the window to be raised with the head of
the was a bad idea. Sometimes a windows could go behind the
omnipresent windows (messages, thread etc.) and never shown (as
covered by the others).
- prevented an info or error message on the command line to overlap
with prompt when asking for user input and, in particular, when
asking for message attachment.
- prevented crash when trying to expand a null string;
- clear send-message-window before deleteing an attach from the list;
- added an info when a status is ready to be sent;
- using a stack to sort drawing order of windows.