updated displayleft.html and adding a new help file

lang/en/help/lesson/displayleft.html

@@ -1,5 +1,7 @@
 <p align="center"><b>Display Left Menu</b></p>
 
-<p>This will show a list of the pages (Branch Tables) in the lesson. Question pages,
-cluster pages, etc. will not be shown by default (you may choose to show question
-pages by checking that option on the question).</p>
+<p>This will show a list of the pages (Branch Tables) in the lesson.</p> 
+<p>Also, by specifying a grade greater than 0, the user taking the Lesson must have a grade equal to
+or greater than the grade set in order to view the Left Menu. This allows Lesson designers to 
+force users to go through the entire lesson during the user's first attempt.  Then, if a user
+retakes the Lesson after meeting the required grade, s/he can see the Left Menu to help with review.</p>

lang/en/help/lesson/progressbar.html

@@ -0,0 +1,11 @@
+<p align="center"><b>Progress Bar</b></p>
+
+<p>Display a progress bar at the bottom of the Lesson.  
+Currently, the progress bar is most accurate with a linear Lesson.</p> 
+<p>While calculating the percent completed, Branch Tables and Question pages that 
+are answered correctly count toward Lesson
+progress.  While calculating the total number of pages in the Lesson, 
+clusters and pages within clusters only count as a single page and End of Cluster and End of Branch
+Table pages are excluded.  All other pages count toward the total number of pages in the Lesson.</p>
+<p>Note: the default styles for the progress bar are not impressive ;)  All of the styles (eg: colors, background images, etc) 
+for the progress bar can be modified in mod/lesson/styles.php.