update theme for online docs (was incorrect in Firefox and Safari)

doc/_themes/blue/static/default.css_t

@@ -30,7 +30,7 @@ div.documentwrapper {
 }
 
 div.bodywrapper {
-    margin: 0 0 0 230px;
+    margin: 0 0 0 270px;
 }
 
 div.body {
@@ -85,7 +85,7 @@ div.related a {
 
 div.sphinxsidebar {
     word-wrap: break-word;
-    width: 240px;
+    width: 270px;
     {%- if theme_stickysidebar|tobool %}
     top: 30px;
     margin: 0;

doc/conf.py

@@ -56,7 +56,7 @@ version_patch = re.search("^W*#\W*define\W+CV_SUBMINOR_VERSION\W+(\d+)\W*$", ver
 # The short X.Y version.
 version = version_major + '.' + version_minor
 # The full version, including alpha/beta/rc tags.
-release = version_major + '.' + version_minor + '.' + version_patch + "-beta"
+release = version_major + '.' + version_minor + '.' + version_patch + "-beta2"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.