Documentation updates for 7.1

docs-source/usersguide/application.rst

@@ -164,7 +164,7 @@ Installing on Linux
 https://simtk.org/project/xml/downloads.xml?group_id=161, then double click the
 .zip file to expand it.
 
-2. Make sure you have Python 2.6 or higher (earlier versions will not work) and
+2. Make sure you have Python 2.7 or higher (earlier versions will not work) and
 a C++ compiler (typically :program:`gcc` or :program:`clang`) installed on your computer.  You can
 check what version of Python is installed by typing :code:`python` |--|\ :code:`version`
 into a console window.

docs-source/usersguide/library.rst

@@ -395,9 +395,9 @@ downloading the Xcode Tools from the App Store.
 Windows: Visual Studio
 ----------------------
 
-On Windows systems, use the C++ compiler in Visual Studio version 10 (2010) or
-later.  You can download a free version of Visual C++ Express Edition from
-http://www.microsoft.com/express/vc/.  If you plan to use use OpenMM from
+On Windows systems, use the C++ compiler in Visual Studio 2015 or later.  You
+can download a free version of the Visual Studio C++ build tools from
+http://landinghub.visualstudio.com/visual-cpp-build-tools.  If you plan to use OpenMM from
 Python, it is critical that both OpenMM and Python be compiled with the same
 version of Visual Studio.
 
@@ -446,13 +446,13 @@ CMake.
 
 * For compiling C and Fortran API wrappers, you need:
 
-   * Python 2.6 or later (http://www.python.org)
+   * Python 2.7 or later (http://www.python.org)
    * Doxygen (http://www.doxygen.org)
    * A Fortran compiler
 
 * For compiling the Python API wrappers, you need:
 
-   * Python 2.6 or later (http://www.python.org)
+   * Python 2.7 or later (http://www.python.org)
    * SWIG (http://www.swig.org)
    * Doxygen (http://www.doxygen.org)
 
@@ -2568,23 +2568,21 @@ install binary packages).
 Installing on Windows
 ---------------------
 
-OpenMM on Windows only works with Python 3.3, so make sure that version is
+OpenMM on Windows only works with Python 3.5, so make sure that version is
 installed before you try installing. For Python installation packages and
-instructions, go to http://python.org.  Note that if you have a 64-bit machine,
-you should still install the 32-bit version of Python since the OpenMM Python
-API binary is 32-bit.  We suggest that you install Python using the default
-options.
+instructions, go to http://python.org.  We suggest that you install Python using
+the default options.
 
 Double click on the Python API Installer icon, located in the top level
 directory for the OpenMM installation (by default, this is C:\Program
 Files\OpenMM).  This will install the OpenMM package into the Python
 installation area.  If you have more than one Python installation, you will be
-asked which Python to use—make sure to select Python 3.3.
+asked which Python to use—make sure to select Python 3.5.
 
 Installing on Linux and Mac
 ---------------------------
 
-Make sure you have Python 2.6 or later installed.  For Python installation
+Make sure you have Python 2.7 or later installed.  For Python installation
 packages and instructions, go to http://python.org.  If you do not have the
 correct Python version, install a valid version using the default options.  Most
 versions of Linux and Mac OS X have a suitable Python preinstalled.  You can
@@ -2593,7 +2591,8 @@ check by typing “\ :code:`python` |--|\ :code:`version`\ ” in a terminal win
 You must have a C++ compiler to install the OpenMM Python API.  If you are using
 a Mac, install Apple's Xcode development tools
 (http://developer.apple.com/TOOLS/Xcode) to get the needed compiler.  On other
-Unix-type systems, install gcc or clang.
+Unix-type systems, install gcc or clang.  We recommend clang, since it produces
+faster code than gcc.
 
 The install.sh script installs the Python API automatically as part of the
 installation process, so you probably already have it installed.  If for some