Merge branch 'master' into sdl2.0

Merging master 2019-september-24 into sdl2.0 branch

docs/en/html/OPTIONS.html

@@ -16,10 +16,10 @@ version
 </h1>
 <h2>Options Documentation</h2>
 
-<p>Copyright (c) 2002-2018 by various contributors; see AUTHORS.txt<br/>
+<p>Copyright (c) 2002-2019 by various contributors; see AUTHORS.txt<br/>
 <a href="http://www.tuxpaint.org/">http://www.tuxpaint.org/</a></p>
 
-<p>December 18, 2018</p>
+<p>September 21, 2019</p>
 
 
 </center>
@@ -192,6 +192,12 @@ version
     cannot be used to reenable sounds if they were disabled using this option.)
   </dd>
 
+  <dt><code><b>nostereo=yes</b></code></dt>
+  <dd>
+    Disable stereo panning support. (Useful for users with hearing impairment
+    in one ear, or places where a single speaker or headphone is being used.)
+  </dd>
+
   <dt><code><b>noquit=yes</b></code></dt>
   <dd>
     <p>Disable the on-screen "Quit" button and prevent the <b>[Escape]</b> key
@@ -1530,6 +1536,7 @@ version
     --allowscreensaver<br>
     --startblank<br>
     --nosound<br>
+    --nostereo<br>
     --noquit<br>
     --noprint<br>
     --printdelay=<i>SECONDS</i><br>
@@ -1606,6 +1613,7 @@ version
     --disablescreensaver<br>
     --startlast<br>
     --sound<br>
+    --stereo<br>
     --quit<br>
     --print<br>
     --printdelay=0<br>