For those of us who are NOT colorblind, this the difference between normal and red-green colorblind link colors:
(Image generated with Vischeck)
There are three styles here:
Visited link: This answer here
Unvisited link: post
Normal text: also suggests
Even in full color, I think the links need more contrast.
I also did some research on achrive.org and found out that the link style was changed some time in January 2014:
Beginning of January 2014
End of January 2014
This change removed the persistent dotted underline, but, on hover, an underline appears. There must have been another change later on, since this doesn't happen now either.