[CFT+Brainstorm] Extending the options framework

[Baptiste Daroussin]

Hi all,

Most of people sems happy with the new framework options however it could be yet
better, here is an attempt to improve it:
http://people.freebsd.org/~bapt/options%2bradio%2bgroup.diff

Among the complains people tends to find that OPTIONS_SINGLE aka 1 among N is
nice but the 0 or 1 among N is not user friendly. So here is OPTIONS_RADIO which
is natively 0 or 1 among N without the need of adding its name to
OPTIONS_DEFINE.

if everyone is happy with OPTIONS_RADIO, then the 0 or 1 feature from
OPTIONS_SINGLE will be removed later once the ports needed that has been
converted to OPTIONS_RADIO

Another feature request I received was the ability to group options into a named
group, to avoid some sort of sorting of option name (nginx is a good example in
my mind that could benefit it. So OPTIONS_GROUP has been created
OPTIONS_GROUP works exactly the same as OPTIONS_MULTI except that is accept 0 or
N among M

if you have better name to propose feel free :)

Please test, send you remark etc.

regards,
Bapt
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