use a consistent default for cornerRadius

[pixelzoom]

AccordionBox and Panel have different values for their cornerRadius options. In the past few sims that I've worked on, we used both AccordionBox and Panel, and this difference forced me to set a consistent cornerRadius. Rather than continue to do this, let's choose a consistent default.

[zepumph]

Sounds like a good idea. I don't have any preference on what that value is.

[jonathanolson]

Changing the current defaults would change sims - would we plan to keep all "current" behavior (adding corner radii overloads in many places)?

[pixelzoom]

Currently: Panel is 10, AccordionBox is 3.

[pixelzoom]

8/23/18 dev meeting consensus: I will change AccordionBox default to cornerRadius: 10, and make all existing call sites set cornerRadius: 3, so that behavior of sims is unchanged.

[pixelzoom]

I changed AccordionBox's default to cornerRadius: 10.

I only had to explicitly set cornerRadius: 3 in 5 sims, FYI responsible developers mentioned here:

area-builder @jbphet
build-an-atom @jbphet
isotopes-and-atomic-mass @jbphet
least-squares-regression @jonathanolson
sugar-and-salt-solutions (unpublished) @samreid

Closing.