IndexTool also looks in index dir's parent for indexer.properties now.
QueryToolServlet supports switching between indices now.

It also automatically gives configuration instructions if it can't find
its properties file.
Made sure QueryTool handles lexical errors gracefully.

Parsers each throw their own TokenMgrError; caught and translated into a
generic ParseError.
Made sure QueryToolServlet gracefully handles unexpected Exceptions.
Corrected typo in forward index warmup log message.
Made sure values are desensitized depending on the field.

When searching on a property that's indexed with the "insensitive only"
setting, but you're searching in "sensitive" mode, values will still be
desensitized for this property. If you didn't do this, you would never
find anything unless you put all your queries in lowercase, which isn't
very useful. In effect, the way the field is indexed may override the
"sensitive" search mode now.