Add plus tests
Add PaxDate.until tests
Add plus/minus tests.
Test date equality.
Format PaxEra javadocs.
Remove Serializable interface from PaxEra
Add documentation for overriden methods.  Supply potential CDML id.
Modify tests for potential CDML value.
Add dateXXX methods to PaxChronology.
Format documentation.
Add override for resolveDate.
Add overrides for making zoned date/times
Add warning comments about value type.
Format javadoc
Have PaxDate extend AbstractDate.
Rename getMonthValue to getMonth
Remove plus(amount, Unit) override.
Remove getLong(field) override
Remove majority of with(field, newValue) override.
Remove unused methods

Remove unused withMonth and withYear methods.