Fix the openwebwork.org link in hardcopy.

[drgrice1]

The webwork2.sty file currently creates this link using the \url command. That command attempts to detect the link type. In this case that results in a file link. Depending on the PDF viewer used, that results in different behavior. In Firefox's PDF viewer it behaves as if it is not a link at all, but just text. Clicking on it does nothing. In Google Chrome's PDF viewer or Evince it is a link, but clicking on it results in a message being displayed that the file does not exist.

So this switches to using the \href command instead. That requires that both the link URL and link text explicitly be given, but reliably results in a working link.

[Alex-Jordan]

Using \href{https://openwebwork.org}{\texttt{openwebwork.org}} would preserve the current look of it. I guess it doesn't matter for this small URL, but for larger URLs where the components are not words, when the URL might need to be manually typed as you read it from printed paper, I tend to lean toward using monospace font.

[drgrice1]

I added \nolinkurl to the link text. That does basically the same thing that \texttt does in this case. Using \nolinkurl is how the hyperref package documents to do this.