Range annotations - deal with nested input data

[lordpretzel]

Currently the way attribute annotations are handled assumes that the input data is flat. When input data is nested, we should duplciate this nesting structure for range annotations too. E.g., for

+ A: INT
+ B: INT
  |
  --- C: INT
  --- D: INT

we should create the annotation structure

+ A: INT
| |
| --- LB: INT
| --- LB: INT
+ B: INT
  |
  --- C: INT
  |   |
  |   --- LB: INT
  |   --- UB: INT
  --- D: INT
  |   |
  |   --- LB: INT
  |   --- UB: INT

Currently this is not high priority since we do not support nested data in Vizier yet.