Added user docs for lower bound operation

src/res/html/help.html

@@ -107,12 +107,25 @@ <h2><a name="problem"></a>Problem Menu</h2>
 
 <h2><a name="ops"></a>Operations Menu</h2>
 
-The Operations menu has two commands for sorting the list of items that are not
-yet assigned to bins in either increasing or decreasing order by size.  
-These commands are only enabled when the application is in
+The Operations Menu has the following three commands:
+<ul>
+<li><b>Sort Decreasing:</b> Sorts the list of items that are not
+yet assigned to bins in decreasing order by size.  
+This command is only enabled when the application is in
+one of the following modes: Practice, First-Fit Decreasing, and Best-Fit Decreasing. 
+It is disabled for the First-Fit and Best-Fit modes.  See the
+<a href="#mode">Mode Menu</a> documentation for more information.</li>
+<li><b>Sort Increasing:</b> Sorts the list of items that are not
+yet assigned to bins in increasing order by size.  
+This command is only enabled when the application is in
 one of the following modes: Practice, First-Fit Decreasing, and Best-Fit Decreasing. 
-They are disabled for the First-Fit and Best-Fit modes.  See the
-<a href="#mode">Mode Menu</a> documentation for more information. 
+It is disabled for the First-Fit and Best-Fit modes.  See the
+<a href="#mode">Mode Menu</a> documentation for more information.</li>
+<li><b>Compute Lower Bound:</b> Computes a lower bound on the number of
+bins for the optimal solution. It may or may not be possible to pack the
+items into this number of bins, but you definitely can't do it with fewer
+bins.</li>
+</ul>
 
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