Converted all files in functions/ to use SM_PATH. This will break all

Converted all files in functions/ to use SM_PATH. This will break all
plugins. Each callable script needs a:

  define('SM_PATH', '../../');

Or something like that put at the top.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@3579 7612ce4b-ef26-0410-bec9-ea0150e637f0