Add additional Thirty360 day counters for the available conventions. Add throw error if user asked for an unknown or hard-deprecated day counter. Allow soft-deprecated day counters to be used with reasonable default conventions, for back compatibility purposes.
Fixes #164
Add additional Thirty360 day counters for the available conventions. Add throw error if user asked for an unknown or hard-deprecated day counter. Allow soft-deprecated day counters to be used with reasonable default conventions, for back compatibility purposes.