Merge pull request #4167 from Mauron/ticket/14458

fixes #4167

* 3.1.x:
  [ticket/14458] Explicitly state RewriteBase into .htaccess root file

phpBB/.htaccess

@@ -1,6 +1,16 @@
 <IfModule mod_rewrite.c>
 RewriteEngine on
 
+#
+# Uncomment the statement below if URL rewriting doesn't
+# work properly. If you installed phpBB in a subdirectory
+# of your site, properly set the argument for the statement.
+# e.g.: if your domain is test.com and you installed phpBB
+# in http://www.test.com/phpBB/index.php you have to set
+# the statement RewriteBase /phpBB/
+#
+#RewriteBase /
+
 #
 # Uncomment the statement below if you want to make use of
 # HTTP authentication and it does not already work.