Changed internal API List_to_LDAPControls() to LDAPControls_from_object()

Reasons: exported symbols of the library should begin with "LDAP",
also gives us a function with a converter signature we can use later.

Modules/ldapcontrol.h

@@ -0,0 +1,15 @@
+/* See http://www.python-ldap.org/ for details.
+ * $Id: ldapcontrol.h,v 1.6 2009/08/04 05:39:10 leonard Exp $ */
+
+#ifndef __h_ldapcontrol
+#define __h_ldapcontrol
+
+#include "common.h"
+#include "ldap.h"
+
+void LDAPinit_control(PyObject *d);
+void LDAPControl_List_DEL( LDAPControl** );
+int  LDAPControls_from_object(PyObject *, LDAPControl ***);
+PyObject* LDAPControls_to_List(LDAPControl **ldcs);
+
+#endif /* __h_ldapcontrol */