Extend DNS lookup commands to allow specifying the name server

* lisp/net/net-utils.el (ffap-string-at-point): Removed due to
'net-utils-machine-at-point' obviating this autoloaded
function (Bug#25426).
(dig-program-options): New customization variable.
(nslookup-host, dns-lookup-host, run-dig): Can now specify
optional name server argument interactively (by prefix arg) and
non-interactively.

* etc/NEWS: Mention the extension of DNS lookup commands.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 3b830c93424..9be6ee0f3f7 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -338,6 +338,12 @@ want to reverse the direction of the scroll, customize
 ** Emacsclient has a new option -u/--suppress-output.  The option
 suppresses display of return values from the server process.
 
+---
+** New user option 'dig-program-options' and extended functionality
+for DNS-querying functions 'nslookup-host', 'dns-lookup-host',
+and 'run-dig'.  Each function now accepts an optional name server
+argument interactively (with a prefix argument) and non-interactively.
+
 
 * Editing Changes in Emacs 26.1