Add missing validator. Fix typo

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
All the columns of a scatter chart should be numeric

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Extend directly from JQplotChart

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Merge branch 'master' of github.com:phpmyadmin/phpmyadmin