Refactored hist methods on SheetView and SheetStack
Refactored hist methods on SheetView and SheetStack

Now return just the histogram, which can be made into a sideplot
using the lshift operator.

vascotenner/holoviews,mjabri/holoviews,ioam/holoviews,basnijholt/holoviews,ioam/holoviews,mjabri/holoviews,vascotenner/holoviews,vascotenner/holoviews,basnijholt/holoviews,ioam/holoviews,basnijholt/holoviews,mjabri/holoviews