[#1768] Convert group/organization_list to use group_dictize and take options. Some minor issues still.
[#1768] Add tests. Take advantage of dictization params where convenient. Refactor packages_field option.
[#1768] Tests fix / PEP8.
[#1768] Use package_count for the sort as well. Transition from legacy tests.
Merge pull request #1840 from ckan/1768-organization-list

 organization_list all_fields misses out extras and users