Issue #1260932 by DjebbZ, pwolanin: hook_nodeapi() optional arguments should not be made required by some core modules either

#246096 by Sutharsan, Pedro Lozano, mr.baileys, andypost: Actions set to run on cron were not actually triggered.

#357031 by hinfox, dereine, aaronbauman: trigger_nodeapi() passed a4 twice and did not pass a3 to the action when the action type was other then node

#203846 by pwolanin and jvandyk: PHP 4 does not allow omitting an object when it is passed by reference, so we need to live with dummy object passing with actions for object-less actions to support PHP 4

#203941 reported and tested by Takafumi, patch by myself: trigger assocations should be removed when deleting an advanced action

#197730 by keith.smith: standardize on a much more user friendly cron reference in help texts, explain its importance with more examples in INSTALL.txt

#200069 by keith.smith: new standard for 'more information' links in module help texts, as the handbook we referred to before was renamed

#197297 by DanW (as GHOP 17), and keith.smith: clean up lots of help texts, update to drag and drop functionality, drupal.module removal, etc

- Patch #191073 by Keith: another good string cleanup by Keith.  (Also removed some trailing whitespace.)

#184722 by hazexp: only return a value from trigger_help() if there was a page which the function provides any help for

#180897 by sun and dvessel: fix various XHTML validity issues in Drupal by closing unclosed tags, avoiding empty table containers, and so on

- Patch #150245 by webchick, bjaspan, ralf, Arancaytar et al: move the .schema files into .install files to prevent mistakes.

#172773 by numerous contributors: Make the actions interface usable by mere mortals (including rename of actions.module to trigger, but keeping the actions themselfs).

Complete previous history of actions module:
 - #148410 by jvandyk: added rewrite of the actions module!
 - #155986 by Uwe: fixed typos.
 - #155828 by Eaton, pwolanin and jvandyk: let actions live even if actions.module is not turned on