* To reduce on errors, I moved the includes for config.php and strings.php

* To reduce on errors, I moved the includes for config.php and strings.php
  into validate.php.
    = They (config/strings) were used eveywhere validate was used
    = Validate already included auth.php (which included i18n.php)
    = Now including just one file does a lot of stuff including loading
      SM config, validating data, and loading internationalization
    = Since we only include config.php once and not dozens of times, we could
      have a slight speed increase

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@1306 7612ce4b-ef26-0410-bec9-ea0150e637f0