Make it easier to find version specific docs.

configure.ac

@@ -1214,7 +1214,7 @@ if test "X$HDF5_DOXYGEN" = "Xyes"; then
   DOXYGEN_HTML_HEADER='$(SRCDIR)/doxygen/hdf5_header.html'
   DOXYGEN_HTML_FOOTER='$(SRCDIR)/doxygen/hdf5_footer.html'
   DOXYGEN_HTML_EXTRA_STYLESHEET='$(SRCDIR)/doxygen/hdf5doxy.css'
-  DOXYGEN_HTML_EXTRA_FILES='$(SRCDIR)/doxygen/hdf5_navtree_hacks.js $(SRCDIR)/doxygen/img/ftv2node.png $(SRCDIR)/doxygen/img/ftv2pnode.png'
+  DOXYGEN_HTML_EXTRA_FILES='$(SRCDIR)/doxygen/hdf5_navtree_hacks.js $(SRCDIR)/doxygen/img/FF-IH_FileGroup.gif $(SRCDIR)/doxygen/img/FF-IH_FileObject.gif $(SRCDIR)/doxygen/img/FileFormatSpecChunkDiagram.jpg $(SRCDIR)/doxygen/img/ftv2node.png $(SRCDIR)/doxygen/img/ftv2pnode.png $(SRCDIR)/doxygen/img/HDFG-logo.png $(SRCDIR)/doxygen/img/IOFlow2.gif $(SRCDIR)/doxygen/img/IOFlow3.gif $(SRCDIR)/doxygen/img/IOFlow.gif $(SRCDIR)/doxygen/img/PaletteExample1.gif $(SRCDIR)/doxygen/img/Palettes.fm.anc.gif'
   DOXYGEN_TAG_FILE=hdf5.tag
   DOXYGEN_SERVER_BASED_SEARCH=NO
   DOXYGEN_EXTERNAL_SEARCH=NO
@@ -1686,7 +1686,7 @@ fi
 ## command-line switch. The value is an include path and/or a library path.
 ## If the library path is specified then it must be preceded by a comma.
 ##
-AC_SUBST([LL_PATH]) 
+AC_SUBST([LL_PATH])
 AC_SUBST([USE_FILTER_SZIP]) USE_FILTER_SZIP="no"
 AC_ARG_WITH([szlib],
             [AS_HELP_STRING([--with-szlib=DIR],
@@ -3037,7 +3037,7 @@ if test -n "$PARALLEL"; then
 fi
 
 ## ----------------------------------------------------------------------
-## Build parallel tools if parallel tools, parallel, and build tools options 
+## Build parallel tools if parallel tools, parallel, and build tools options
 ## are all enabled.
 ##
 AC_SUBST([PARALLEL_TOOLS])
@@ -3057,7 +3057,7 @@ if test "X${PARALLEL_TOOLS}" = "Xyes"; then
     AC_MSG_ERROR([--enable-tools is required for --enable-parallel-tools])
   fi
   if test "X${PARALLEL}" != "Xyes"; then
-    AC_MSG_ERROR([--enable-parallel is required for --enable-parallel-tools])  
+    AC_MSG_ERROR([--enable-parallel is required for --enable-parallel-tools])
   fi
 fi
 

doxygen/dox/Overview.dox

@@ -1,14 +1,11 @@
 
 /** \mainpage notitle
 
-This is the documentation set for HDF5. You can
-<a href="hdf5-doc.tgz">download</a> it as a tgz archive for offline reading.
-
-This is the documention set for HDF5 in terms of specifications and software
-developed and maintained by <a href="https://www.hdfgroup.org/">The HDF
-Group</a>. It is impractical to document the entire HDF5 ecosystem in one place,
-and you should also consult the documentation sets of the many outstanding
-community projects.
+This is the documention set for HDF5 and includes specifications and documentation
+of software and tools developed and maintained by
+<a href="https://www.hdfgroup.org/">The HDF Group</a>. It is impractical to document
+the entire HDF5 ecosystem in one place, and you should also consult the documentation
+sets of the many outstanding community projects.
 
 For a first contact with HDF5, the best place is to have a look at the \link
 GettingStarted getting started \endlink page that shows you how to write and
@@ -19,12 +16,28 @@ technical documentation consists to varying degrees of information related to
 <em>tasks</em>, <em>concepts</em>, or <em>reference</em> material. As its title
 suggests, the \link RM Reference Manual \endlink is 100% reference material,
 while the \link Cookbook \endlink is focused on tasks. The different guide-type
-documents cover a mix of tasks, concepts, and reference, to help a certain
+documents cover a mix of tasks, concepts, and reference, to help a specific
 <em>audience</em> succeed.
 
-Finally, do not miss the search engine (top right-hand corner)! If you are
-looking for a specific function, it'll take you there directly. If unsure, it'll
-give you an idea of what's on offer and a few promising leads.
+\par Versions
+     Version-specific documentation (see the version in the title area) can be found
+     here:
+     - HDF5 <code>develop</code> branch (this site)
+     - <a href="https://docs.hdfgroup.org/hdf5/v1_12/index.html">HDF5 1.12.x</a>
+     - <a href="https://docs.hdfgroup.org/hdf5/v1_10/index.html">HDF5 1.10.x</a>
+     - <a href="https://docs.hdfgroup.org/hdf5/v1_8/index.html">HDF5 1.8.x</a>
+
+\par Search
+     If you are looking for a specific function, constant, type, etc., use the
+     search box in the top right-hand corner!\n Otherwise, check out the
+     \link FTS full-text search\endlink.
+
+\par Offline reading
+     You can <a href="hdf5-doc.tgz">download</a> it as a tgz archive for offline reading.
+
+\par History
+     A snapshot (April 2017) of the pre-Doxygen HDF5 documentation can be found
+     <a href="https://hdfgroup.github.io/archive/hdf5doc/">here</a>.
 
 \par ToDo List
      There is plenty of <a href="./todo.html">unfinished business</a>.