Fixes in thanks file

The inc/md2html.cfg file was in this case updated for the keywords (not
that many would think of it, maybe, but since I was making another fix I
added the keyword 'ta') and more importantly HEADER_2. The file is not
just about fixing old entries but rather help in every other way too.
Thus it now reads 'Thanking people for their help'.

The thanks-for-help.{md,html} has also been fixed in the above way and
the 'thanks for all the fish' is now a link.

	'Ta ta and thanks for all the fish :-)'

thanks-for-help.md

@@ -1,7 +1,7 @@
-# Thanks for all the fixes
+# Thanks for all the help
 
 
-## .. and thanks for all the fish. :-)
+## .. and [thanks for all the fish](https://hitchhikers.fandom.com/wiki/So_Long,_and_Thanks_for_All_the_Fish). :-)
 
 To avoid having to change numerous "_index.html_" files to add thank you notes,
 we centralize them below.