Old SolrMarc relied on the file suffix to determine whether an input file was XML. This newer version looks at the contents of the start of the file to make that determination. The tests it used were too narrowly specific. This patch checks a few more patterns at the start of the file to decide whether an input file is XML or not.
Note: the required jars haven't changed since the original v3.0.0
The simple_install_package consists of the solrmarc_core_X.X.X.jar plus all of the required jars, plus a few mostly empty directories set up in the way that SolrMarc expects.