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426ec1f989
New semantics is as follows:
[-p <dir>] --add adds all games in <dir> or
working dir
[-p <dir>] --detect enumerates dectected games in
<dir> with their ids
[-p <dir>] --game <id> --add adds just game <id> if found
in <dir> and not already added
[-p <dir>] --recursive --add adds all games in <dir> and
subdirs if not already added
[-p <dir>] --recursive --game <id> --add
adds just game <id> if found
in <dir> or its subdirs and
not already added
[-p <dir>] --recursive --detect enumerates games in <dir>
and subdirs
[-p <dir>] --auto-detect launches the first game
found in <dir>
[-p <dir>] --recursive --auto-detect
displays error message
The reason for the displaying an error message when attempting to do
autodetection on a whole tree is mainly one of UX, IMO it *might* get
confusing on a sufficiently large/deep tree.
The relevant if() can be removed safely if it's concluded that's not the
case.