#1517 (ok 4.5) Support for virtual/persistent columns

[Marc]

currently virtual columns as defined by mariadb (https://mariadb.com/kb/en/virtual-columns/) are not supported.
It is not possible to edit or create these columns.

Even more after changing columns in phpmyadmin and adding columns via plain sql, phpadmin sometimes refuses to load the table.

[Madhura Jayaratne]

Work in progress: https://github.com/phpmyadmin/phpmyadmin/pull/1657

[Madhura Jayaratne]

On hold due to https://sourceforge.net/p/phpmyadmin/feature-requests/1663/