Changes for OVPMS-1511 Stock export and import

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6176 9e4fa352-aafb-0310-9071-df624684024b
Integrated changes for OVPMS-1517 Add a new Discount type to produce a discount based on cost price plus a rate, contributed by Ben Charlton

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6195 9e4fa352-aafb-0310-9071-df624684024b
Added CustomerTaxRules.getTaxRate(Product product, Party customer)

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/trunk@6197 9e4fa352-aafb-0310-9071-df624684024b
Integrated changes for OVPMS-1517 Add a new Discount type to produce a discount based on cost price plus a rate, contributed by Ben Charlton

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/branches/1.8-dev@6200 9e4fa352-aafb-0310-9071-df624684024b
Added check for different products for same quantities to stock importer

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/branches/1.8-dev@6202 9e4fa352-aafb-0310-9071-df624684024b
merged back changes from trunk

git-svn-id: svn://svn.openvpms.org/openvpms/archetypes/branches/1.8-dev@6203 9e4fa352-aafb-0310-9071-df624684024b