add custom field in FAQ module

[joebordes]

Hi

I just tried this again to make sure and it is working correctly for me.

If you have a running system you have to:
- make changes to modules/Faq/Faq.php, please be VERY careful the slightest letter change can break the code which I think is what happened
- make sure you have the vtiger_faqcf table in the database

there is not much more to it.

Let us know how it goes.