v0.9.1

Fix a crash (OverflowError deep in plotext) when plotting a float16 branch/column/dataset/array containing large-but-finite values. np.histogram() computes bin edges in the input's own dtype, so two large float16 edges could overflow when added together to get a bin center -- now the array is upcast to float64 before histogramming, and genuine non-finite (inf/nan) values are filtered with a clear note rather than crashing or raising an obscure numpy error. Format-agnostic fix (shared core.py code) reported against a real HDF5 file.