[patch #1202] Xterm title with format string (MC_XTITLE env var)

[Oswald Buddenhagen <savannah-bounces gnu org>]

Follow-up Comment #1, patch #1202 (project mc):

another worthwhile power user patch that gets zero attention ... :(

a much simpler variant that is limited to a fixed user host:/path has been
posted by jindrich novy, but i'm no fan of it.
so back to this patch:

a --title command line option would be useful as well, as things like "xterm
-e su -c 'mc --title root'" would be unnecessarily complicated with an env
variable. also note, that env variables are inherited - this would lead to
unexpected results in some more exotic use cases.

i found, that appending to the already existing title (see bug #13750) would
be very helpful:
 xterm -T konsole1
 xterm -T konsole2
 xterm -T root -e su
 xterm -T ktown -e ssh ktown
 xterm -e mc
 xterm -e mc --title mc2
in the interactive shells mc is aliased to 'mc --append-title'. think
"konsole1: ~ - mc". the benefit is obvious, i think.

--title "" would remove the "mc -" part entirely to save some space in the
task bar.

carrying the %-expandos to excess:
 %o - old title
 %a - current status ("" (=view), "edit").
      note that %w/%W would have to be extended to mean the current file in
view/edit mode.
 %A - precise current status (%a plus the usual file operations like copy,
move, etc.)
 %f/%F - the object %A currently refers to. mabe this is redundand and would
make sense to change %w/%W's behavior when %A is in "detail mode", because
nobody would want both of them in the same title bar (it would not fit into
any task bar anyway).
 %{[var]?[text1]:[text2]} - if var (see above) is non-empty, text1, otherwise
text2 (both subject to further expansion).
with these, one could create things like this:
 "%{o?%o (mc):mc}: %{a?%a :}%w"
or the normal variant, but optimized for prefix size (for narrow task bar
entries):
 "%{o?%o\: :}%w - mc"
or for the pedantic:
 "mc%{o? (%o):} - %{A?%A:view} %F"


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