title: How to remove an installed package in Emacs (ver 24+)?
body: <p>I'd like to remove several packages that I've installed.  When I invoke <code>package-list-packages</code>, I notice that there is a '<code>d</code>' (mark for deletion) command and an '<code>x</code>' (execute).  However, it seems like this simply removes the package name/description from the list and not the actual files under <code>~/.emacs.d/elpa</code>.  What am I doing wrong or missing?  Surely there must be some way to remove installed packages.</p>