- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

#199336 by JirkaRybka: remove improper t() use in update code (update goes all in English, but there were some mistakes), and add messages to updates where there was no return value otherwise, so users know what happens in each update

- Patch #164532 by catch, pwolanin, David Strauss, et al.: improve table indicies for common queries.

- Patch #163246 by keith smith, freso, O Govinda, catch, webchick et al: fixed minor spelling issues and fixed spacing issues.

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

    * Removes the hard-coded 'book' type and perform all node actions
      equally on any node type via hook_nodeapi.
    * Achieves 100% integration with the menu system.  Improves
      performance of book rendering.
    * All the algorithms have been changed to use the tree data structure
      returned by the menu system.
    * Added support for 'multiple books'.
    * Some UI improvements.

  This is a momumental patch that took 69 iterations. Although there is
  room for improvement, this is a big step forward.  Thanks for the
  persistence, pwolanin.

- Patch #79428 by Chris Johnson: remove int display width declarations from MySQL create table statements.

- Patch #68926 by chx, jeremy, steven, eaton, webchick, amazon, neil, nedjo et al: an initial install system for Drupal core.