Rename 'F. Bernthal' to full name 'Frederick M. Bernthal'

I recorded 'F. Bernthal' as an alias of 'Frederick M. Bernthal'.
Both names refer to the same person in AR1 WGIII.
Add 1 CLA author missing from AR1 WGIII Ch1

See related issue: #49
https://github.com/medea-project/ipcc-database/issues/49