Add back the publish target to manual Makefile.

`make publish` requires setting of WEBDIR variable to specify
where to copy the manual.

This partially reverts f1b27b3.

Author: pavoljuhas

doc/manual/Makefile

@@ -2,13 +2,14 @@
 # Available targets:
 #
 #   all      -- (default) build pdfgui manual in HTML and PDF formats
-#   publish  -- upload the latest manual to www.diffpy.org
 #   clean    -- remove intermediate texinfo files
 #   cleanALL -- delete all generated files
+#   publish  -- copy the compiled manual files to WEBDIR directory
 #
 # Variables:
 #
 #   EQBUILD  -- extract PNG equations for HTML manual
+#   WEBDIR   -- the rsync target directory.  Required by "publish" target.
 
 
 all: pdfgui.pdf pdfgui.html
@@ -33,9 +34,16 @@ clean:
 	    pdfgui.vr pdfgui.tp pdfgui.pg pdfgui.ky pdfgui.fn \
 	    pdfgui.cps pdfgui.cp pdfgui.toc pdfgui.aux pdfgui.log \
 	    pdfgui.vrs
-	/bin/rm -f -- images/eq-*.png
 
 
 cleanALL: clean
 	/bin/rm -f pdfgui.html pdfgui.pdf
 	$(MAKE) -C images clean
+
+
+publish: all
+ifndef WEBDIR
+	$(error Set WEBDIR to define rsync target directory.)
+endif
+	rsync -pRt --chmod=a+rwx,go-w,Fa-x \
+	    pdfgui.html pdfgui.pdf images/*.png $(WEBDIR)