Spaces in option names, output names

[codeplea]

There is some inconsistency in the naming of options and outputs. It looks like all of the output names use an underscore to separate words, while option names use spaces. Some option names have special characters, such as % signs.

I don't know if this is a problem, or something that even needs addressed, but it might be worth thinking about.

All of the names are defined in indicators.tcl.

See also https://github.com/cirla/tulipy/issues/29