Updates to Errata Page

I have now tracked down some of the information for the links that were no longer working on the Errata page and have pulled in copies of as many of the pages as I could to be on this site.
It was a quick and dirty copy from Wayback Machine, so there are probably some broken links and/or missing images on some of the pages, but the basic information should be there.
Someday after I’m retired, I may try and organize all of the bits and pieces in a better organized fashion.