Update coding standards and style guide and move to the Wiki

[rossb]

A wiki page should be created to document our coding standards. There is currently a page here: http://www.portaudio.com/docs/proposals/014-StyleGuide.html however we need a better way to update and add to it.

We have no documented or agreed standard for use of SVN (creating branches rather than breaking the trunk, etc).

Note that we currently have no standard for the formatting of comments.

Note that there are some display errors in http://www.portaudio.com/docs/proposals/014-StyleGuide.html since it embeds > and < without escaping them.