Update documentation about lead and cycle time

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+Analytics for tasks
+===================
+
+Each task have an analytics section available from the left menu in the task view.
+
+Lead and cycle time
+-------------------
+
+![Lead and cycle time](http://kanboard.net/screenshots/documentation/task-lead-cycle-time.png)
+
+- The lead time is the time between the task creation and the date of completion (task closed).
+- The cycle time is the time between the start date and the date of completion.
+- If the task is not closed the current time is used instead of the date of completion.
+- If the start date is not specified, the cycle time is not calculated.
+
+Note: You can configure an automatic action to define automatically the start date when you move a task to the column of your choice.
+
+Time spent into each column
+---------------------------
+
+![Time spent into each column](http://kanboard.net/screenshots/documentation/time-into-each-column.png)
+
+- This chart show the total time spent into each column for the task.
+- The time spent is calculated until the task is closed.