Added a template version with the sidebar hidden.
Set full width to the default template, because that fit's the needs of the
webiste I am building right now best, as the sidebar is only to be displayed on
a few static pages and all other content that may be added later should not
contain the sidebar. Former default tempalte is now called sidebar.php
Created a template for a site without childmenu displayed (I use this e.g. on a blog)