Sums data is now a property on the column object.

Columns can now be rearranged and the sums will match up properly.
Extended column_data api method with group sums meta.

Updated the angular work package service to extend the column objects with all the sums.
Merge pull request #1068 from opf/feature/angular-api-work-package-loading-sums-rework

Feature/angular api work package loading sums rework