feat: bring back the `numbering` option and deprecate it

This fixes the second issue in #6.

doc/moloch.tex

@@ -244,6 +244,14 @@ The list of options is structured as shown in the following example.
 
 \subsubsection{Outer theme}
 
+\DescribeOption{numbering}{none, counter, fraction}{}{
+  \emph{This option is deprecated and will be removed in a future version.
+    Please use Beamer's |page number in head/foot| template instead.}
+  Controls whether the frame number at the bottom right of each slide is
+  omitted (|none|), shown (|counter|) or displayed as a fraction of the total
+  number of frames (|fraction|).
+}
+
 \DescribeOption{progressbar}{none, head, frametitle, foot}{none}{
   Optionally adds a progress bar to the top of each frame (|head|),
   the bottom of each frame (|foot|), or directly below each frame title

src/beamerouterthememoloch.dtx

@@ -82,6 +82,34 @@
 %    \end{macrocode}%
 % \end{macro}
 %
+% \subsubsection{Deprecated Options}
+%
+% These options are deprecated and will be removed in a future version.
+%
+% \begin{macro}{numbering}
+%    Adds slide numbers to the bottom right of each slide.
+%    \begin{macrocode}
+\pgfkeys{
+  /moloch/outer/numbering/.cd,
+  .is choice,
+  none/.code={%
+      \PackageWarning{moloch}{The ``numbering'' option is deprecated.
+        Use beamer's ``page number in head/foot'' template instead}%
+      \setbeamertemplate{page number in head/foot}[default]
+    },
+  counter/.code={%
+      \PackageWarning{moloch}{The ``numbering'' option is deprecated.
+        Use beamer's ``page number in head/foot'' template instead}%
+      \setbeamertemplate{page number in head/foot}[framenumber]
+    },
+  fraction/.code={%
+      \PackageWarning{moloch}{The ``numbering'' option is deprecated.
+        Use beamer's ``page number in head/foot'' template instead}%
+      \setbeamertemplate{page number in head/foot}[totalframenumber]
+    },
+}
+%    \end{macrocode}
+% \end{macro}
 %
 %
 % \subsubsection{Head and footline}