Try to make web item updates atomic-ish.

The Jenkins workspace is exported as the web site. So when updating files
that take time, such as making MP3, create to a temp file and rename into place.

makeWebItems.sh

@@ -17,16 +17,21 @@ graphicsdir=$dir/graphics/$1
 
 mkdir -p $builddir
 
-# Now, for each tune, make the tune JPG and sound.
+# Now, for each tune, make the tune JPG and sound. Do this to temp
+# files and rename into place to make updates as atomic as possible.
 find $booke -name "*.abc" | sort |
     while read filename
     do
         name=`basename $filename .abc`
-        convert $graphicsdir/${name}.eps $builddir/${name}.jpg
+        convert $graphicsdir/${name}.eps $builddir/${name}.jpg.tmp
 
-        abc2midi $filename -o $builddir/${name}.mid
-        timidity -Ow -o $builddir/${name}.wav $builddir/${name}.mid
-        lame --quiet $builddir/${name}.wav $builddir/${name}.mp3
-        rm $builddir/${name}.wav
+        abc2midi $filename -o $builddir/${name}.mid.tmp
+        timidity -Ow -o $builddir/${name}.wav.tmp $builddir/${name}.mid.tmp
+        lame --quiet $builddir/${name}.wav.tmp $builddir/${name}.mp3.tmp
+
+        mv $builddir/${name}.jpg.tmp $builddir/${name}.jpg
+        mv $builddir/${name}.mid.tmp $builddir/${name}.mid
+        mv $builddir/${name}.mp3.tmp $builddir/${name}.mp3
+        rm $builddir/${name}.wav.tmp
     done