rename schema file to correct typo
solr/: Reformat xml files according to 4-space indent.
Solr README not needed
Don't need JTS.
Don't need _version_ in schema
Trim down schema's excessive comments and unused field types.
Make enableRemoteStreaming disabled by default but settable via system property.
Remove most of the request-handler half of solrconfig.xml that wasn't used.
Rewrote build.xml to download solr.war and winstone.jar etc.

* No need for opensextant.home or jetty.home or solr.war committed to source control; it's self-sufficient by downloading what it needs
* Doesn't use EmbeddedSolrServer -- no need; just use Solr's csv update
* Don't unpack solr4-conf.zip; don't need those files