Private message refactoring: fix up various template issues. Added a template tag to generate the URL to send a PM to a user. This replaced the {% url 'messages-compose_to' username %} in various templates.

/* CSS file for cell dialog in the table plugin */

.panel_wrapper div.current {
	height: 200px;
}

.advfield {
	width: 200px;
}

#action {
	margin-bottom: 3px;
}

#class {
	width: 150px;
}