[Om-synth] changes in Tree.h

[Vinicius Santos]

In cvs, there are some assertions in the the Tree class destructor,
but no header is included. Here is a fix.

Index: src/engine/Tree.h
===================================================================
RCS file: /sources/om-synth/om-synth/src/engine/Tree.h,v
retrieving revision 1.1
diff -u -r1.1 Tree.h
--- src/engine/Tree.h   13 Nov 2005 10:31:20 -0000      1.1
+++ src/engine/Tree.h   10 Jan 2006 21:09:45 -0000
@@ -19,6 +19,7 @@

 #include <cstdlib>
 #include <string>
+#include <cassert>
 #include "MaidObject.h"
 using std::string;