RFE#861: Simulate UPDATE queries.

RFE#861: Simulate UPDATE queries.
https://sourceforge.net/p/phpmyadmin/feature-requests/861/

![rfe_861](https://cloud.githubusercontent.com/assets/6863616/3316642/fa5e84be-f704-11e3-8327-58eddc88af13.png)


Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>