Feature Request: #1329 Can't rename column with foreign key constraint.

Feature Request: #1329 Can't rename column with foreign key constraint.
https://sourceforge.net/p/phpmyadmin/feature-requests/1329/

1) When a column is referenced by other:
![referenced](https://f.cloud.github.com/assets/6863616/2492929/8353a6b4-b268-11e3-9338-e9d2b97889b4.png)

2) When a column is a foreign key:
![foreign_key](https://f.cloud.github.com/assets/6863616/2492930/97a7d770-b268-11e3-993b-7de027a47d92.png)

3) When its both:
![both](https://f.cloud.github.com/assets/6863616/2492931/a533361e-b268-11e3-98bd-61264cab0c49.png)


Signed-off-by: Ashutosh Dhundhara <ashutoshdhundhara@yahoo.com>