So that we can actually find commandline.inc.
This should have been updated when the files in the EmailSummary tree
where moved down a level into subdirectories.
lib/plugin.php now has a parent onAutoload function that finds most common
files that are used in plugins (actions, dataobjects, forms, libs etc.) if
they are put in the standardised directories ('actions', 'classes', 'forms',
'lib' and perhaps some others in the future).