More explicit support for Unicode title case

[Julian Graham]

Hi all,

I was doing some auditing of Guile's support for the functionality
required by the R6RS "Standard Libraries" specification, and I noticed
that Guile's character and string APIs are missing support for
title-cased Unicode characters [0].  ...So I added it.

Find attached a patch (including documentation and unit tests) that
adds title case-related functions as appropriate to the areas of the
system that deal with character case.  In particular, the core
character API, SRFI-13, and i18n are affected.

Can someone do a quick review on the patch, and, provided there are no
issues, commit it -- or let me know and I'll do it myself?  (I've
gotten a significantly more confident with git over the past few
months.)


Thanks,
Julian


[0] - http://www.unicode.org/versions/Unicode5.0.0/ch05.pdf#G21180

0001-Improved-support-for-Unicode-title-case-in-Guile-s-s.patch
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