hist: index overflow bins
hist: exclude overflow by default in generators
hist: iter iterates over bin proxies
hist: __getitem__ and __setitem__ provide/accept BinProxies
hist: fix unit tests
docs: rm start.rst
update root2matplotlib and plotting.utils to new binning convention
hist: minimum -> min and maximum -> max
hist: accept 2-tuple in __setitem__ to set both content and error
hist: remove unneeded DomainError
hist: begin experimental HistView concept for slicing and rebinning
hist: make Get/SetEntries a property
hist: construct copy from view, with possible rebinning
hist: check that at least two edges are specified
hist: implement Hist2DView and Hist3DView
hist: __setitem__ support repeating single value