mbarbin / cubzzle / 71

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Enable unused code warnings in ppx generated code

This required two small tweaks:

 - 1. Remove the `[@@deriving fields]` as most of what is generated is
   unused. The only used value is the getter `size`.

There is [@deriving fields ~getters] available, to only generate the
getters, but currently I couldn't find a way to make the ppx only
generate the single [size] getter. Thus resorting to add the getter
manually.

- 2. Upon removing the accessor code, another warning was revealed

File "src/box.ml", lines 3-4, characters 4-3:
3 | ....z_shape : Z_shape.t
4 |   ;.............................................
Error (warning 69 [unused-field]): record field z_shape is never read.

Thus I removed it from the record.

2 of 2 new or added lines in 1 file covered. (100.0%)

244 of 314 relevant lines covered (77.71%)

2169291.51 hits per line