#192767 by fago, Eaton, chx: taking form_state per reference in form constructor function. Will be replaced with a nicer PHP 5 solution in Drupal 7.

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

XSS fixes forward ported from Drupal 5.1 - previously not committed parts of http://drupal.org/cvs?commit=53675

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

#193191 by chx: allow form elements to enable form caching - allows custom form elements to leverage the AHAH framework

#191104 by keith.smith: (usability) change occurances of node to 'post' and 'content' as appropriate

#190283 by myself and JirkaRbyka: use get_t() in pre-database setup code, add missing javascript key to language objects (kills notices) and document st() better

#111719 follow up patch by multiple contributors: ensure proper XHTML id attribute values for form elements

#184867 by deekayen, catch and keith.smith: fix some spelling errors in our source code and messages printed

#181328: pass on whole form to #process functions to enable advanced form handling (such as required by some CCK widgets)

#169079 by yched: improve consistency of menu API and batch API by allowing batch definition in non .module files, which opens the possibility of better performing batches (which are likely to reside in .admin.inc files generally)
 - apply this change in locale.module
 - improve batch API code documentation

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

#182310 by chx: remove #DANGEROUS_SKIP_CHECK, as with the AHAH functionality now we have safer methods to add things in the cached form for validation, so we don't need this security hole possibility kept anymore.

#181741 by quicksketch: fix AHAH throbber/progress bar issues and generalize progress display configuration to allow module developers to choose from the throbber and progress bar

#157752 by quicksketch: extend AHAH functionality to most types of form elements, without writing JavaScript. Also AHAH enable the blocks admin page.

#145251 by chx: document that one needs to include the proper 'op' value in arrays passed to drupal_execute() to trigger the right action

#150851 by pwolanin and chx: different radio buttons in the same set should have different HTML id values (XHTML validity fix)

#169247 by profix898 slightly modified: fix E_NOTICE when form_id is not set on a non-programmed form

#85208 by neclimdul and bjaspan (slightly modified): if no maxlength was specified, do not generate an empty HTML attribute

  This is a small form API extension (doesn't break existing code) that
  facilitates the Drupal 6 upgrade of the Views module.  A good example
  of why it can be beneficial to start upgrading your modules early on in
  the code freeze. ;)