Possibly disabling the plot for a compound type dataset

[kyang2014]

Check http://hdfgroup.s3.amazonaws.com/data/hdf5test/comp_complex.h5

Test a windows version of the release candidate from S3.

Whether clicking a field or not, I always see the following plot generated.

If you look at carefully, it always gives you the first sub field values,(0,1) to (1,3) and (0,2) to (2,4). This doesn't make sense. However, for some users, they may just want to see this. So I am uncertain if this is necessary but just leave this for the experts to make the decision.

[giumas]

@kyang2014 After this #130, you could try to fix this issue.