- update copyrights, fix some typos
 - declare encoding
 - cleanup imports
 - incorporate BPMRule functionality
 - define which helpers are override able, which aren't
BPMRule.py
 - remove, because Rule.py provide same functionality
BPMInvoiceTransactionRule.py
BPMInvoicingRule.py
BPMOrderRule.py
BPMDeliveryRule.py
 - use Rule instead of BPMRule
 - remove not needed disclaimer


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28517 20353a03-c40f-0410-a6d1-a30d3c3de9de