include Products.CMFCore in zcml

This is to get rid of errors when starting the instance (Plone >= 4.1).
minor template cleanup (remove extra spaces)
move 'Display sort order' button to the right, refs #5
consistent spacing in templates (2 spaces)
update HISTORY.txt
Merge pull request #12 from jcerjak/move-display-sortorder

Move Display sort order button and some other small fixes