yoda: Ability to make options deprecated

When summary text is not provided, the option in question
is parsed, but is not shown in the help text.

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>
yoda: Extend error codes returned by generated parsing routine

0 is OK, -1 is parsing error.
1 is special option (help/version currently) was requested.

Signed-off-by: Pavel Emelyanov <xemul@sacred.ru>