Sphinx] Reduce build chatter

doc/tutorial/Makefile

@@ -27,9 +27,22 @@ IMAGES = $(IMAGES_EPS) $(IMAGES_PNG) $(IMAGES_PDF)
 
 .NOTPARALLEL:
 
-%.eps : %.dia; $(DIA) -t eps $< -e $@
-%.png : %.dia; $(DIA) -t png $< -e $@
-%.pdf : %.eps; $(EPSTOPDF) $< -o=$@
+%.eps : %.dia
+	@echo dia $(notdir $<)
+	@$(DIA) -t eps $< -e $@ >/dev/null
+
+%.png : %.dia
+	@echo dia $(notdir $<)
+	@$(DIA) -t png $< -e $@ >/dev/null
+
+%.png : %.eps
+	@echo convert $(notdir $<)
+	@$(CONVERT) $< $@ >/dev/null
+
+%.pdf : %.eps
+	@echo epstopdf $(notdir $<)
+	@$(EPSTOPDF) $< -o=$@ >/dev/null
+	@if test x$($@_width) != x; then $(RESCALE) $($@_width) $@ ; fi
 
 help:
 	@echo "Please use \`make <target>' where <target> is one of"