- Patch #504564 by tic2000, andypost, catch: the 'Length of trimmed content'

  form input in the 'node type' edit form was way too harsh (affects the
  display of all 'trimmed / summary_or_trimmed' formatters on all text
  fields in all view modes), and irrelevant for text fields on non-node
  entities, which are currently all blocked to 'trim to 600 chars'.

   * Added field formatter settings for 'text_trimmed' and 'text_summary_or_trimmed' formatters
   * Removed 'teaser_length' settings for node types
   * Added upgrade path for 'teaser_length' variable in node_update_7011()
   * Fixed a test