add migration 2.0 file that should include

• steps of content migration like
  – remove objects when page type changed
	– migrate page objects container_name changes
	– list files to be removed
	– list config params to be removed or migrated

• define contents of schulcms-example.sql dumps
simplify event model and user interface

• ATTENTION > down migration is not implemented (make backup before up migration!)
• migration removes teaser after prepending it's content (to html) to body_preview
• new simplified layout with all date / time / location info in one line
add new field body_preview_short

• replaces previously removed teaser, is automatically filled at saving body_preview by extracting first paragraph
• add migration file to change db
update all newly created body_preview_short fields

• IMPORTANT
	add migration steps for migrating event fields from teaser > body_preview > body_preview_short
fix errors in saving body_preview[_short]

• remove old teaser code WIP
remove teaser related code WIP