Enable to set formatter and editor on the same cell
Cleanup to renderCell/formatter refactor
Add formatter test to editor.html to test preservation of formatter
Fix regression in renderCell/formatter RE formatter + undefined data
Add formatter test to 2nd grid in tree.html test page
Update CHANGES.md to reflect formatter coexistence
Update formatter note in CHANGES.md to reference related issue
Fix #481: update README to outline issue reporting and support
Add note about pull requests to README
Add note to README about commercial support