[FIX] audittrail : remove other dependency in terp file

lp bug: https://launchpad.net/bugs/488754 fixed

bzr revid: hmo@tinyerp.com-20091130061406-0pujk0wtryrerz2k

addons/audittrail/__terp__.py

@@ -28,7 +28,7 @@
     Subscribe Rules for read, write, create and delete on objects and check logs""",
     'author': 'Tiny',
     'website': 'http://www.openerp.com',
-    'depends': ['base', 'account', 'purchase', 'mrp'],
+    'depends': ['base'],
     'init_xml': [],
     'update_xml': [
         'audittrail_view.xml',