implements getSource/DestinationInventoriatedTotalAssetPrice to use asset price if total asset price is not set.

change permissions of isConvergent, isDivergent, isSimulated from View to AccessContentsInformation


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5280 20353a03-c40f-0410-a6d1-a30d3c3de9de