Array editor: Change default float formatter from %.3f to %.6g

[bcolsen]

Currently this array:

a = np.array([3.2e-9,45.6e56,22.3,57666.6,0.00000004])

looks like this in the array editor with the default %.3f formatting:

I can't tell what most of those numbers are.

But it could look like this with %.6g formatting:

If you think this is a good idea I should be able to do a PR.

[jitseniesen]

I like this.

[ccordoba12]

Ok, @bcolsen please submit a PR for this.

[ccordoba12]

Sorry, I just saw there's already a PR for this.