Changeset 987 for trunk/common/newsletter.php

HTML Newsletter

This patch adds support for HTML in the infoarena newsletter. A newsletter can be created just like a regular wiki page, using textile, macros, and templates. Sending is still done with a command-line script.

• Adds HTML newsletter library.
• Adds UI, display index of all newsletters.
• Adds UI, view newsletter in browser.
• Adds migration script to convert old text/plain newsletters to decent textile versions.
• Adds external library: PHPMailer (​http://phpmailer.codeworxtech.com/index.php?pg=phpmailer).