Bundling schema

Hi,

Well, since people had some objections about removing Expat entirely. I
decided to work on that bundling scheme I was talking about awhile ago.
I have a commit pending that achieves this, initially by changing the
expat extension. Essentially what it does is separate the bundling of
expat itself with the xml extension.

By creating ext/bundle and storing expat in ext/bundle/expat, I have the
following options cleanly available:

./configure --disable-xml

(disables the xml extension, but bundles expat)

./configure --disable-bundle-all

(don't bundle any libraries)

./configure --enable-bundle-all

(bundle all the libraries)

./configure

(bundle defaults)

./configure --disable-bundle-expat --with-expat-dir=/usr/local/

(use the expat libraries in /usr/local/)

If no one has any major objections, I'll commit this to cvs.

-Sterling

"I can't give you a brain, so I'll give you a diploma"
- The Great Oz, The Wizard of Oz