#360023 by greggles, rszrama, stella, sun, andypost: add missing comment publish action and clean up some code documentation

#306611 by joshk, jbomb, sun, dereine, andypost: avoid calling nonexistent action callbacks (eg. when a module is disabled); also backport some documentation improvements

#265265 by neochief, jhodgdon: missing phpdoc @code tags on PHP code examples in form.inc and actions.inc

#290282 by kratib, jvandyk, ainigma32: Only track/limit the recursive invocations of actions_do(), instead of tracking/limiting them all.

#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

 - whitespaces at end of lines
 - indentation
 - control structure usage
 - whitespace in empty lines
 - phpdoc comment formatting

#194149 reported by hswong3i, in patch form by Rob Loach: action loading was using improper variable and property names

Four watchdog() calls which still used t(), identified by myself after implementing extraction code for Drupal 6 at #182765

#174170 by Shiny: different method to insert an action row with default values, so it works with PostgreSQL too

 - always include CVS Id tags in all files
 - add a new line after the CVS Id, if more code or phpdoc follows in the same code block
 - fix bogus Id tags previously added

  This is a very important patch, but one that is merely an enabler.
  Hopefully we'll see more people submitting "action patches" in the
  near future.

  Thanks for the hard work and persistence, John.  *If* you decide
  to update the Drupal Pro Development book to Drupal 6, make sure
  to add a chapter on actions. ;)