some documentation updates and fixes

doc/Makefile: add a rule to regenerate gf-help-full.txt
gf-help-full.txt: updated (new parse tree visualization options)
demo & cloud index: clarifications
minibar documentation: better layout on mobile devices
GF 3.4 release notes: reorganized & updated

src/www/index.html

@@ -9,17 +9,19 @@
 
 <h1><a href="http://www.grammaticalframework.org/"><img src="Logos/gf0.png" alt=""></a><img class=nofloat src="P/gf-cloud.png" alt=""> GF Cloud Service</h1>
 
-<h2>Available Web Applications</h2>
+<h2>Web Applications</h2>
 
 <ul>
   <li><a href="minibar/minibar.html">Minibar</a>
+      (word-completing translation tool)
   <li><a href="syntax-editor/editor.html">Syntax Editor (beta)</a>
   <li><a href="TransQuiz/translation_quiz.html">Translation Quiz</a>
   <li><a href="gfse/">GF online editor for simple multilingual grammars</a>
   <li><a href="translator/">Simple Translation Tool</a>
+      (bilingual document editor)
 </ul>
 
-<h2>Some Documentation</h2>
+<h2>Documentation</h2>
 
 <ul>
   <li><a href="minibar/about.html">About Minibar</a>