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/text/TibetanMachineWeb.java

@@ -295,7 +295,7 @@ public class TibetanMachineWeb {
 			System.out.println("reading "+fileName);
 			String line;
 			boolean hashOn = false;
-			boolean isSanskrit = false;
+			boolean isSanskrit = false; //FIXME: this is never read.
 			boolean ignore = false;
 
 			while ((line = in.readLine()) != null) {