Modular improvements

Make FOXML date properties be indexed as dates, prevent some garbage text, and rewrite the "slurp MODS" to use templates instead of for-eaches.

I could push the other Solr config files as well... I think it's a good idea, 'cause then you can just symlink to the "conf" directory wherever this repo gets cloned.

Similarly, the basic GSearch XSLTs (browseIndexToResultPage.xslt, copyXml.xslt, gfindObjectsToResultPage.xslt and updateIndexToResultPage.xslt) and associated files (index.properties and indexInfo.xml) could be thrown here as well, so the entire repo could just be cloned as $CATALINA_HOME/webapps/fedoragsearch/WEB-INF/classes/whatever-config/index/gsearch_solr, to have the majority of a working GSearch configuration.