[Tagging] README tag with editor support

[Mike N]

On 6/11/2015 6:17 PM, David wrote:
> Perhaps more emphasis is needed on good manners when editing existing data too.

I believe these are mostly honest mistakes with good intentions.  If 
someone traces imagery or works a fixup challenge while watching TV, 
99.99% of edits might be to verify and match to the imagery.  The .001% 
is something that takes awareness and a more detailed look to properly 
resolve.