Use BasicCalendarSystem.SetYear directly from BasicYearPeriodField, instead of using the year DateTimeField.
Use BasicCalendarSystem.SetYear directly from BasicYearPeriodField, instead of
using the year DateTimeField.

malcolmr/nodatime,jskeet/nodatime,nodatime/nodatime,malcolmr/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,nodatime/nodatime,malcolmr/nodatime,jskeet/nodatime