Configuration Variable - due

- Added support for the "due" configuration variable that defines
  how many days into the future when a task is considered due.

html/config.html

@@ -195,6 +195,14 @@
                   Defaults to 80.
                 </dd>
 
+                <dt>due</dt>
+                <dd>
+
+                  This is the number of days into the future that define when a
+                  task is considered due, and is colored accordingly.
+                  Defaults to 7.
+                </dd>
+
                 <dt>color</dt>
                 <dd>
                  May be "on" or "off".  Determines whether task uses color.

html/task.html

@@ -104,6 +104,9 @@
                       which may be spelling mistakes or deprecated variables.
                   <li>"configure --enable-debug" now supported to suppress compiler optimization
                       to allow debugging.
+                  <li>Allow lower case priorities, and automatically upper case them.
+                  <li>Added support for "due" configuration variable which defines the number
+                      of days in the future when a task is considered due.
                 </ul>
 
                 <p>