Merge remote-tracking branch 'origin/v3.2.x'

Conflicts:
      ci/azure-pipelines-steps.yml
        - removed on master branch
      doc/_static/mpl.css
        - whitespace
      lib/matplotlib/axes/_axes.py
         - kept master version, don't forward-port feature fill for older
           numpys that we no longer support
      lib/matplotlib/backend_bases.py
         - PIL in required on master, don't forward port version checking fix
         - kept master branch version on all doc changes
      INSTALL.rst
      doc/api/prev_api_changes/api_changes_3.2.0/deprecations.rst
      doc/devel/coding_guide.rst
      doc/devel/min_dep_policy.rst
      doc/faq/howto_faq.rst
      examples/user_interfaces/embedding_in_tk_sgskip.py
      lib/matplotlib/backends/backend_agg.py
      lib/matplotlib/image.py
      lib/matplotlib/pyplot.py
      lib/matplotlib/tests/test_axes.py
      lib/matplotlib/tests/test_colorbar.py
      lib/matplotlib/tests/test_fontconfig_pattern.py
      lib/mpl_toolkits/axes_grid1/axes_grid.py
      lib/mpl_toolkits/mplot3d/axes3d.py
        - kept master branch version

Author: tacaswell

doc/_static/mpl.css

@@ -8,7 +8,7 @@
     font-family: 'CarlogoRegular';
     font-style: normal;
     src:    local('Carlito'),
-            url('fonts/carlogo-regular.woff2') format('woff2'), 
+            url('fonts/carlogo-regular.woff2') format('woff2'),
             url('fonts/carlogo-regular.woff') format('woff'),
             url('fonts/carlogo-regular.ttf') format('truetype')
 }
@@ -17,7 +17,7 @@
     font-family: 'CarlogoBold';
     font-style: bold;
     src:    local('Carlito Bold'),
-            url('fonts/carlogo-bold.woff2') format('woff2'), 
+            url('fonts/carlogo-bold.woff2') format('woff2'),
             url('fonts/carlogo-bold.woff') format('woff'),
             url('fonts/carlogo-bold.ttf') format('truetype')
 }
@@ -1150,14 +1150,14 @@ nav.main-nav{
     font-family: 'CarlogoRegular', 'Carlito', sans-serif;
     font-size: 16px;
   }
-  
+
   nav.main-nav ul{
     margin: 0;
     padding: 0;
     display: flex;
     flex-direction: row;
   }
-  
+
   nav.main-nav li{
     margin: 8px 15px;
     list-style-type: none;
@@ -1166,7 +1166,7 @@ nav.main-nav{
   nav.main-nav a{
     color: white;
   }
-  
+
   nav.main-nav a:hover{
     text-decoration: underline;
   }
@@ -1217,4 +1217,4 @@ hr.box-sep {
     div.box-item {
         flex: 0 0 90%;
     }
-}
+}

doc/_templates/layout.html

@@ -38,7 +38,7 @@
         <div style="float: left; position: absolute; width: 496px; bottom: 0; padding-bottom: 24px"><span style="float: right; color: #789; background: white">Version {{ version|e }}</span></div>
         <img src="{{pathto("_static/logo2_compressed.svg", 1) }}" height="125px" border="0" alt="matplotlib"/></a>
     {%- endif %}
-    
+
     <!-- The "Fork me on github" ribbon -->
     <div id="forkongithub"><a href="https://github.com/matplotlib/matplotlib">Fork me on GitHub</a></div>
     </div>
@@ -92,9 +92,9 @@
         (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
         m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
         })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
-      
+
         ga('create', 'UA-55954603-1', 'auto');
         ga('send', 'pageview');
-      
+
 </script>
-{%- endblock %}
+{%- endblock %}