Rework the NodaTime.Test references slightly to remove RequiredTargetFramework, which we don't have anywhere else. (And remove DataSetExtensions which are pointless.)
Rework the NodaTime.Test references slightly to remove RequiredTargetFramework,
which we don't have anywhere else. (And remove DataSetExtensions which are
pointless.)

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