Hossman's comments about when jars are built had me thinking,
its not really great how dependencies are managed currently.
say i have contrib/hamburger that depends on contrib/cheese
if I do 'ant test' in contrib/hamburger, you end out with a situation
where you have no hamburger.jar but you have a cheese.jar.
The reason for this: i think is how we implement the contrib-uptodate,
via .jar files. I think instead contrib-uptodate shouldnt use actual
jar files (cheese.jar) but a simple file we 'touch' like cheese.compiled.
This will make the build faster, especially I think the solr tests
which uses these dependencies across a lot of lucene modules. we won't
constantly jar their stuff.