Changed the Help so that chapters with only 1 page are directly linked, saving a click.

Added pluggable template parser docs.
From the dev list, changed HTMLTemplateExpr to translate all dots in template
variables to underscores, since EXPR's don't do dots, just like TemplateToolkit.

lib/WebGUI/Help/Template_HTMLTemplateExpr.pm

@@ -0,0 +1,13 @@
+package WebGUI::Help::Template_HTMLTemplateExpr;
+
+our $HELP = {  ##hashref of hashes
+	'html template expr' => {
+		title => 'html template expr title',
+		body => 'html template expr body',
+		related => [
+		],
+	},
+
+};
+
+1;  ##All perl modules must return true