Fix for 0002842: User still receives email after account is disabled.

• core/user_api.php
  (user_is_enabled): function added to allow checking that a user is enabled before sending emails.

• core/email_api.php
  (build_bcc_list):

  • Changed checks for "user_exists()" to be "user_exists() and user_is_enabled()"
  • Added "WHERE enabled = 1" to SQL queries returning candidate users to be emailed.

• doc/ChangeLog

  • documented the fix.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@1827 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9