#967 SAIL grid report logic for repeated field array handling

[drrwebber]

If column is repeatable single element - then use this index of index syntax in the report grid

a!gridTextColumn(
label: "approvers",
field: "approvers",
data: index(index(local!datasubset.data, "approvers", null),1,null)
)

Also remove field: {} because you cannot sort on a multi-value field

a!gridTextColumn(
label: "approvers",
field: {},