* remove unnecessary related keys from last change
* fix gap_id related key and add a preferred_gap related key
* get VAT from simulation before printing invoice
* support for portal types and simulation_state translations


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4062 20353a03-c40f-0410-a6d1-a30d3c3de9de