Clarify BBBC036

[bethac07]

BBBC036 is a subsample of BBBC047; specifically, a 54 plate subsample (see below).

Right now, the link out points to a host of the full 047 dataset, and we don't specify how to subsample it. The main screen count of fields also I think is for the full 047 dataset (I checked the total count of images in the 036 folder below, and it's 622080, which works out to 124416 fields, which is the exact number you'd expect for 54 plates/ 384 wells per plate/ 6 fields per well). We should clarify both.

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