Returns the short description of this object suitable for an
inventory listing.
Result
A string with the capitalized short description of this object,
or "" if the object is invisible.
The result is normally just the capitalized Short() of this object.
Actual objects may redefine InvShort() as they please to.
The returned string is contains no linebreaks.
EXAMPLE
string sh;
if ("" != (sh = obj->Short()))
write(sh+"\n");