1. hook_form_validate_alter and hook_form_execute_alter have been eliminated. there usage was limiting and a bit confusing. now, only hook_form_alter remains
   2. replacing those hooks are the #validate and #execute attributes. these can be used either when building the form in a module, or via hook_form_alter. these attributes are built in array form, to allow for flexibility in how they are called. for example, a module could simply add an element to the #validate array via hook_form_alter if it wished to perform additional validation, or it could redeclare the entire #validate array if it wanted to override any existing validation
   3. attributes #validation_arguments and #execution_arguments have been added to allow args to be used w/ custom validation and execution functions. this are also declared in array format
   4. renamed #valid attribute to #validation. this doesn't cause any conflicts, and makes the naming convention more consistent
   5. renamed the existing #execute attribute associated w/ submit buttons to #submit

- Patch #38296 by Ber: generate rel-tags for book pages.  Makes it easier to browse in some browsers.

#36658: Make search query pgsql compatible.

- Patch #35121 by m3avrck: fixed problem with list and description values aren't saved for uploaded files.

  Improves usability of the admin/menu page.

  readability of the code.

- Patch #28062 by Souvent22: make it possible to assign weights to contact form categories and fixed some small glitches.

   + Fixed problem with configuration of comment display options.
   + Introduced defines for the various comment settings.

- Patch #35524 by asimmonds / drewish: converted the custom block forms code to the forms API's execute model.