Corrected country name in Country_Code enumeration.
Added Validate to Contacted_Op class to test for callsign with no
prefix or suffix.
Load AdifEnumerations.xml from AppData\HamQSLer folder.
If cannot read from AddData\HamQSLer, copy AdifEnumerations.xml from
program assembly, then load.
Check file version against version on website and download if website
version is newer.