Request for new round of SBuf review

Hi all,
   I feel that SBuf may just be complete enough to be considered a
viable replacement for SquidString, as a first step towards
integration.
I'd appreciate anyone's help in giving it a check to gather feedback
and suggestions.

Doxygen documentation for the relevant classes is available at
http://eu.squid-cache.org/~kinkie/sbuf-docs/ , the code is at
lp:~kinkie/squid/stringng
(https://code.launchpad.net/~kinkie/squid/stringng).

Thanks!

-- 
    /kinkie