Update Vim modeline and Emacs file-local variables

Both:
  * Force the file type to Perl
  * Set the tab width to 8 so that people cringe in horror at the
    sight of a tab
  * Set the line with to 99

Emacs:
  * Disable indent-tabs-mode
  * Set the indentation level to 4

Vim:
  * Highlight column 100

Addresses #206

ddclient.in

@@ -5215,7 +5215,16 @@ sub nic_cloudns_update {
 __PACKAGE__->main() unless caller() && caller() ne 'PAR';
 
 ######################################################################
-# vim: ai et ts=4 sw=4 tw=78:
+## Emacs and Vim settings
 
+# Local Variables:
+# mode: perl
+# fill-column: 99
+# indent-tabs-mode: nil
+# perl-indent-level: 4
+# tab-width: 8
+# End:
+
+# vim: ai et ts=8 sw=4 tw=99 cc=+1 filetype=perl
 
 __END__