Cleanup of code

I made a cleanup in the code for 6.x-4.3 release. The only piece of code changed was in node.tpl.php. In t(' in ');, I changed for t('in'); as "in" is already translated in many languages in the core translations.

For php and css files, I followed the Drupal CS. Other minor details are in the text files (limited to 80 chars wide were possible and not when inconvenient) and the CVS tag $Id$ that was missing or incorrectly placed in some files. Tabs chars were replaced by spaces and leading spaces were stripped.