install the common HTML files into etc/htdig/ to allow the user to override them with own ones

htdig/htdig.spec

@@ -86,7 +86,7 @@ AutoReqProv:  no
     ./configure \
         --prefix=%{l_prefix} \
         --with-config-dir=%{l_prefix}/etc/htdig \
-        --with-common-dir=%{l_prefix}/share/htdig \
+        --with-common-dir=%{l_prefix}/etc/htdig \
         --with-database-dir=%{l_prefix}/var/htdig/db \
         --with-default-config-file=%{l_prefix}/etc/htdig/htdig.conf \
         --with-cgi-bin-dir=%{l_prefix}/cgi \