Update constraint.png table, add its odt origin file and add the link into...

Update constraint.png table, add its odt origin file and add the link into matfaust.factparams.ConstraintName API doc.

Issue #84 related.

wrapper/matlab/+matfaust/+factparams/@ConstraintName/ConstraintName.m

@@ -3,6 +3,9 @@
 
 % =========================================================
 %> This class defines the names for the sub-types of constraints into the ConstraintGeneric hierarchy of classes.
+%>
+%> The table <a href="constraint.png">here</a> is a summary of the available constraints.
+%>
 % =========================================================
 classdef ConstraintName
 	properties (SetAccess = public, Constant)