* add 'cache_id_func' argument in CachingMethod.__init__ to specify how to generate cache_id, that is especially useful when you want to use for instance methods where args contain 'self'.
* use 'cache_id_func' in ERP5TypeInformation._getRawActionInformationList().


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29691 20353a03-c40f-0410-a6d1-a30d3c3de9de