Metacat

As part of a patch fix for:

http://bugzilla.ecoinformatics.org/show_bug.cgi?id=2469

I've added a second constructor to PathIndexEntry.java. The first
constructor is used to represent a record entry from the xml_index
table, and the new second constructor represents a record entry in
the xml_path_index table. I've added both nodeData and nodeDataNumerical
as variables that will store the record's data during the indexing process.