Format option slider settings

[Algae94]

The GUI shows a slider with a scale from 1 to 5 for Bar Height, but the default is 30 and numeric properties like this should be a textbox. pbiviz has an internal list of reserved variable names that have special GUI format options. One example is 'opacity' would be a slider from 0 to 100%. the variable name 'barHeight' is reserved and causing this slider issue. Suggest changing the variable name from 'barHeight' to 'barH' to resolve