Removing dead visiquest link (rebased onto dev_5_0)



This is the same as gh-1403 but rebased onto dev_5_0.

----

Visiquest seems to have been discontinued, it's not listed on the accusoft website anymore and as such the link is broken.

(Re: the other broken link in the current builds - I'm hoping the jpeg2000 link will start working again because the official specification docs aren't free so I could only link to intro page)