[boost] [optional] Documentation updated.

From: Fernando Cacciola (fernando_cacciola_at_[hidden])
Date: 2003-12-03 20:59:24

I finally got around to update the Boost.Optional documentation to reflect
recent additions.
The new doc contains a _new_ intoduction that tries to better present the
library interface w.r.t to its models and purpose.

I purposedly left out some points about optional references since these are
most likely unused by every user but Joel de Guzman, and, as we already
discussed, the semantics of optional<T&> assignment WILL change after
1.30.2.

Enjoy,

Fernando Cacciola
SciSoft