stationxml-validator-1.6.0.1-SNAPSHOT

Compares FDSN-xml files to FDSN-xsd schema.
Removed latitude and longitude conditions because they are taken care of by the xml to xsd comparison.
Updated to work with both Java 11 and Java 8.
Added nested messaging to deal with rules associated with channel stages.
Fixed rule 332 bugs.
Startime must be less than endtime rather than equal logic update.
Removed various null pointer exceptions.