Use semantic markup for :program: self-references

Sphinx has it's own :program: syntax for refering to program names.
Use it for self-references in manual pages. These self-references are
not clickable and not as eye-cathing as links, which is a good thing.
There is no point in attracting attention to ``dig`` several times on a
single page dedicated to dig itself.

Substituted automatically using:
    find bin  -name *.rst | xargs fgrep --files-with-matches '.. program' | xargs -n1 bash /tmp/repl.sh

With /tmp/repl.sh being:
    BASE=$(basename "$1" .rst)
    sed -i -e "s/\`\`$BASE\`\`/:program:\`$BASE\`/g" "$1"

bin/confgen/ddns-confgen.rst

@@ -27,7 +27,7 @@ Synopsis
 Description
 ~~~~~~~~~~~
 
-``ddns-confgen`` is an utility that generates keys for use in TSIG signing.
+:program:`ddns-confgen` is an utility that generates keys for use in TSIG signing.
 The resulting keys can be used, for example, to secure dynamic DNS updates
 to a zone, or for the ``rndc`` command channel.
 
@@ -40,7 +40,7 @@ command-channel security.)
 
 Note that ``named`` itself can configure a local DDNS key for use with
 :option:`nsupdate -l`; it does this when a zone is configured with
-``update-policy local;``. ``ddns-confgen`` is only needed when a more
+``update-policy local;``. :program:`ddns-confgen` is only needed when a more
 elaborate configuration is required: for instance, if ``nsupdate`` is to
 be used from a remote system.
 

bin/confgen/rndc-confgen.rst

@@ -26,7 +26,7 @@ Synopsis
 Description
 ~~~~~~~~~~~
 
-``rndc-confgen`` generates configuration files for ``rndc``. It can be
+:program:`rndc-confgen` generates configuration files for ``rndc``. It can be
 used as a convenient alternative to writing the ``rndc.conf`` file and
 the corresponding ``controls`` and ``key`` statements in ``named.conf``
 by hand. Alternatively, it can be run with the :option:`-a` option to set up a
@@ -46,7 +46,7 @@ Options
 
    If a more elaborate configuration than that generated by
    :option:`rndc-confgen -a` is required, for example if rndc is to be used
-   remotely, run ``rndc-confgen`` without the :option:`-a` option
+   remotely, run :program:`rndc-confgen` without the :option:`-a` option
    and set up ``rndc.conf`` and ``named.conf`` as directed.
 
 .. option:: -A algorithm
@@ -68,7 +68,7 @@ Options
 .. option:: -h
 
    This option prints a short summary of the options and arguments to
-   ``rndc-confgen``.
+   :program:`rndc-confgen`.
 
 .. option:: -k keyname
 
@@ -113,7 +113,7 @@ To allow ``rndc`` to be used with no manual configuration, run:
 To print a sample ``rndc.conf`` file and the corresponding ``controls`` and
 ``key`` statements to be manually inserted into ``named.conf``, run:
 
-``rndc-confgen``
+:program:`rndc-confgen`
 
 See Also
 ~~~~~~~~

bin/confgen/tsig-keygen.rst

@@ -27,7 +27,7 @@ Synopsis
 Description
 ~~~~~~~~~~~
 
-``tsig-keygen`` is an utility that generates keys for use in TSIG signing.
+:program:`tsig-keygen` is an utility that generates keys for use in TSIG signing.
 The resulting keys can be used, for example, to secure dynamic DNS updates
 to a zone, or for the ``rndc`` command channel.