actions 5.x-2.6

Changes since DRUPAL-5--2-5:

• #286445 by deekayen: administer_actions becomes administer actions
• #286542 by deekayen: code cleanup (thanks, coder.module!)
• #286573 by deekayen: remove menu access callback (artifact from backport)
• #260957 by Dave Cohen: correct default type for $context
• #260955 by Dave Cohen: cron actions need default 'run' op
• Link to explanation of presave patch in README.
• #311170 by Liliplanet: use theme function for username in system_message_action
• #261814 by jaydub: remove redundant index from actions_aid table
• #309919 by deekayen: increase op column width to max possible: 46 chars
• #295475 by pcorbett: add MSSQL support
• Update node.module.patch for Drupal 5.10
• Create DRUPAL-5--2 branch, where continued development will happen (see #263392