add option to scale/unscale report plots

[adelavega]

already available in the API

[rwblair]

• scale by default
• tooltip
• toggle button

[adelavega]

Related: #760

[adelavega]

Note to self: only do unit scaling

[rwblair]

@adelavega We don't store a 'scale' boolean in the database right now. The dictionary the api returns for each plot has a config.scale.bandPaddingInner value, which is either 0.015 or 0.0 depending on type of plot.

Then there's encoding.fill.scale, I tried curling against api/analyses/AZ4qk/report?run_id=1233&scale=False and api/analyses/AZ4qk/report?run_id=1233 and the values didn't change. Am I passing the scale boolean properly there?

Is there a way for the front end to determine if a plot is scaled or not or will we need to start tracking that in the database?

[adelavega]

Closed with #788