Removed/commented out/tagged some unused local variables.

Added a JUnit test for the new Trie that fails at present since the Trie is
case-insensitive.  Running JUnit tests is not something our build system
knows about at present, but Eclipse 2.0 makes it very easy.

Fixed a few compiler errors due to imports I'd forgotten.

source/org/thdl/tib/scanner/Manipulate.java

@@ -272,7 +272,7 @@ public class Manipulate
 	{
 	    sil = sil.toLowerCase();
 	    
-	    int i=0, len=sil.length();
+	    int i=0;
 	    char ch, ch2;
 	    
 	    while (!isVowel(sil.charAt(i))) i++;