Updates to the ltl2tgba ajax version.

* wrap/python/ajax/ltl2tgba.html: Remove the auto-update button, and
enable auto-update automatically after the first submission.  Add
tools tips for the "Desired Output" tabs, and the Spot logo.
Add a email icon to encourage feedback.
* wrap/python/ajax/ltl2tgba.css: fix sizes of formula field and
send button.  Set position of mail icon.
* wrap/python/ajax/logos/mail.png: New logo, based on a public
domain SVG icon retrieved today from
http://commons.wikimedia.org/wiki/File:Internet-mail.svg

wrap/python/ajax/css/ltl2tgba.css

@@ -5,6 +5,13 @@ html {overflow-y:scroll;}
     font-size: 1em;
 }
 
+input.formula {
+    width: 700px;
+}
+div#send {
+    width: 80px;
+}
+
 div.ltl2tgba {
     width: 800px;
     position:relative;
@@ -33,6 +40,12 @@ div.ltl2tgba {
   bottom:10px;
   z-index:1;    
 }
+#mailicon {
+  position:fixed;
+  left:10px;
+  top:84px;
+  z-index:1;
+}
 
 .ltl2tgba div.ui-widget-content { 
     padding: 3px;