Bug-fix: in 'plotHistBars' - comparison with 'log' was using 'is'...; also fixed issue with y-limits, added minor opacity to hist-bars.
Bug-fix: in 'plotHistBars' - comparison with 'log' was using 'is'...; also fixed issue with y-limits, added minor opacity to hist-bars.

lzkelley/zcode,lzkelley/zcode