Many template fixes
- add singlecolumn template for login form and the like
- add sidepanel template for templates with explicit sidepanels
- fix location of history link
- DO NOT FIX publish button, as this should be overridden in dbor using submit_line.html as template
make link lists better in sidepanel
fix select all functionality in actions form
add pre and postactions blocks to submit_line template for adding additional buttons to form