Fix author URLs

All the authors now have either a null URL, a valid URL or one on the
Internet Wayback Machine.

Where it seemed likely (say because the domain no longer exists) emails
were set to null also.

Now unless a bug is found in the script this really should finish the
checks of authors.html.

authors.html

@@ -1218,8 +1218,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#AU">AU</a> - <em>Commonwealth of Australia</em> (<em>Australia</em>)
 <br>
-URL: <a href="http://www.jcu.edu.au/~ccptd/">http://www.jcu.edu.au/~ccptd/</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Paul_Dale.json">Paul_Dale</a>
 <p>
 </p>
@@ -1282,7 +1280,7 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#PL">PL</a> - <em>Republic of Poland</em> (<em>Poland</em>)
 <br>
-URL: <a href="https://sun.aei.polsl.pl//~sdeor/">https://sun.aei.polsl.pl//~sdeor/</a>
+URL: <a href="https://sun.aei.polsl.pl/~sdeor/">https://sun.aei.polsl.pl/~sdeor/</a>
 <br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Sebastian_Deorowicz.json">Sebastian_Deorowicz</a>
 <p>
@@ -1317,7 +1315,7 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
 <br>
-URL: <a href="http://www.neta.com/~dodson/">http://www.neta.com/~dodson/</a>
+URL: <a href="https://web.archive.org/web/20000816152741/http://www.neta.com/~dodson/">https://web.archive.org/web/20000816152741/http://www.neta.com/~dodson/</a>
 <br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Don_Dodson.json">Don_Dodson</a>
 <p>
@@ -1821,7 +1819,7 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
 <br>
-URL: <a href="http://www.oxinet.co.uk/jim">http://www.oxinet.co.uk/jim</a>
+URL: <a href="https://web.archive.org/web/19991003012715/http://www.oxinet.co.uk/jim/">https://web.archive.org/web/19991003012715/http://www.oxinet.co.uk/jim/</a>
 <br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Jim_Hague.json">Jim_Hague</a>
 <p>
@@ -2422,8 +2420,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#NL">NL</a> - <em>Kingdom of the Netherlands</em> (<em>Netherlands</em>)
 <br>
-URL: <a href="http://huizen.dds.nl/~lievaart">http://huizen.dds.nl/~lievaart</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Roemer_B_Lievaart.json">Roemer_B_Lievaart</a>
 <p>
 </p>
@@ -2511,8 +2507,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#ZZ">ZZ</a> - <em>Unknown location</em>
 <br>
-URL: <a href="http://www.klg.com">http://www.klg.com</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Ed_Lycklama.json">Ed_Lycklama</a>
 <p>
 </p>
@@ -2569,7 +2563,7 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#IT">IT</a> - <em>Italian Republic</em> (<em>Italy</em>)
 <br>
-URL: <a href="http://www.assezeta.com/sandromaffiodo">http://www.assezeta.com/sandromaffiodo</a>
+URL: <a href="https://web.archive.org/web/20170706135649/http://www.assezeta.com/sandromaffiodo/">https://web.archive.org/web/20170706135649/http://www.assezeta.com/sandromaffiodo/</a>
 <br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Sandro_Maffiodo.json">Sandro_Maffiodo</a>
 <p>
@@ -2622,8 +2616,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)
 <br>
-URL: <a href="http://cam.cornell.edu/adrian/">http://cam.cornell.edu/adrian/</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Adrian_Mariano.json">Adrian_Mariano</a>
 <p>
 </p>
@@ -2916,8 +2908,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#IL">IL</a> - <em>State of Israel</em> (<em>Israel</em>)
 <br>
-URL: <a href="http://www.cadtech.co.il/profile.html">http://www.cadtech.co.il/profile.html</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Doron_Osovlanski.json">Doron_Osovlanski</a>
 <p>
 </p>
@@ -3223,7 +3213,7 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
 <br>
-URL: <a href="http://www.softbase.co.uk/">http://www.softbase.co.uk/</a>
+URL: <a href="https://web.archive.org/web/20041128214304/http://www.softbase.co.uk/">https://web.archive.org/web/20041128214304/http://www.softbase.co.uk/</a>
 <br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Peter_J_Ruczynski.json">Peter_J_Ruczynski</a>
 <p>
@@ -3404,8 +3394,6 @@ author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master
 </p>
 Location: <a href="location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
 <br>
-URL: <a href="http://www.cs.bris.ac.uk/~nathan/">http://www.cs.bris.ac.uk/~nathan/</a>
-<br>
 author_handle: <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/author/Nathan_Sidwell.json">Nathan_Sidwell</a>
 <p>
 </p>