Move JavaScript related to table operations page to a js file of its own

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Move drop database handling code to db_operations.js

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Move more JS code to tbl_operations.js

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
login-link is no longer used since automatic redirection is used

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