use download for document files (#180)

Author: Tieqiong

doc/source/index.rst

@@ -17,8 +17,8 @@ or neutron diffraction data and comes with built in graphical and structure
 visualization capabilities.
 
 PDFgui is a friendly interface to the PDFfit2 refinement engine, with many
-powerful extensions. To get started, please open the `manual <../../manual/pdfgui.html>`_ 
-from the help menu or follow the `tutorial instructions <tutorial.html>`_.
+powerful extensions. To get started, please open the manual (:download:`html <../manual/pdfgui.html>`
+/:download:`pdf <../manual/pdfgui.pdf>`) from the help menu or follow the :ref:`quick_start`.
 
 =======
 Authors

doc/source/tutorial.rst

@@ -1,6 +1,4 @@
-:tocdepth: -1
-
-.. index:: tutorial
+.. _quick_start:
 
 Tutorial
 ########
@@ -15,8 +13,8 @@ Lesson 1: Creating simple fit of Ni PDF
 
 Input files:
 
-* `Ni-xray.gr <../../tutorial/Ni-xray.gr>`_ - experimental X-ray PDF data
-* `Ni.stru <../../tutorial/Ni.stru>`_ - Ni f.c.c. structure in PDFfit format
+* :download:`Ni-xray.gr <../tutorial/Ni-xray.gr>` - experimental X-ray PDF data
+* :download:`Ni.stru <../tutorial/Ni.stru>` - Ni f.c.c. structure in PDFfit format
 
 Procedure:
 
@@ -136,8 +134,8 @@ Learn how to string together fits.
 References
 ==========
 
-1. `(pdf) <../../manual/Proffen-jac-1999.pdf>`_,
+1. :download:`(pdf) <../manual/Proffen-jac-1999.pdf>`,
    Th. Proffen and S. J. L. Billinge, PDFFIT a program for full profile structural refinement of the atomic pair distribution function, J. Appl. Crystallogr. 32, 572-575 (1999)
 
-2. `(pdf) <../../manual/Farrow-jpcm-2007.pdf>`_,
+2. :download:`(pdf) <../manual/Farrow-jpcm-2007.pdf>`,
    C. L. Farrow, P. Juhas, J. W. Liu, D. Bryndin, J. Bloch, Th. Proffen and S. J. L. Billinge, PDFfit2 and PDFgui: Computer programs for studying nanostructure in crystals, J. Phys.: Condens. Matter 19, 335219 (2007)