Fixing #230; add a scrollbar to the PM popup dialog if necessary. This wasn't as easy as I thought. Had to wrap the PM text in a div with its styling (max-height and overflow). If I then resized the dialog, I'd get two scrollbars. So for now, made the dialog non-resizable.

/* 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;
}