Merge pull request #759 from nsendetzky/master

Applies patch from scrutinizer-ci and fixes text exports
Merge pull request #760 from nsendetzky/master

Merge branch 'master' of https://github.com/Arcavias/arcavias-core
Merge pull request #761 from nsendetzky/master

Calculates fixed and percent rebates according to tax rates and don't notify the user if a service item in the basket couldn't be migrated
Merge pull request #762 from nsendetzky/master

Fixes monetary rebate calculation
Merge pull request #763 from nsendetzky/master

Improves update basket bugfix
Merge pull request #764 from nsendetzky/master

Adds Arcavias icon in admin interface and updates core JS package