[Minor] fix stupid bad td width in privmsgs compose interface

Merging in the last couple of revisions from stable

Fixed search indexer causing duplicate keys when two "words" of 64+ characters encountered and first 64 characters are the same (thanks Vadi); attempt to fix onunload confirmation during page editing

Corrected licensing issue on YoungPup's DOM-Drag (it is now public domain -> GPLv2+ for Enano); fixed wrongful access denial under specific circumstances (fetch_page_acl() on nonexistent page + wiki mode)

Made CAPTCHA for guests' page editing work with the non-AJAX interface

Added ability to require CAPTCHA for guests when editing pages (AJAX INTERFACE ONLY)

Replaced TinyMCE 2.x with 3.0 beta 3. Supports everything but IE. Also rewrote the editor interface completely from the ground up.

More localization work. Resolved major issue with JSON parser not parsing files over ~50KB. Switched JSON parser to the one from the Zend Framework (BSD licensed). Forced to split enano.json into five different files.

Fix missing avatar-related columns in users table

[Minor] fix non-localized string in installer (install_stg_buildindex_*); fix wrong string_id in pophelp:url_schemes

NOW the installer should work.

A minor installer fix to get the installer to run again. TODO: fix bad call to $lang->get() in preinstallation environment set up by index.php