update rigid body reference outputs. add bodyforces early examples

examples/rigid/in.rigid.early

examples/rigid/in.rigid.nve.early

examples/rigid/log.20Apr18.rigid.atomfile.g++.1

examples/rigid/log.20Apr18.rigid.atomfile.g++.4

examples/rigid/log.20Apr18.rigid.atomvar.g++.1

examples/rigid/log.20Apr18.rigid.atomvar.g++.4

examples/rigid/log.20Apr18.rigid.early.g++.1

examples/rigid/log.20Apr18.rigid.early.g++.4

examples/rigid/log.20Apr18.rigid.g++.1

examples/rigid/log.20Apr18.rigid.g++.4

examples/rigid/log.20Apr18.rigid.nve.early.g++.1

examples/rigid/log.20Apr18.rigid.nve.early.g++.4

examples/rigid/log.20Apr18.rigid.nve.g++.1

examples/rigid/log.20Apr18.rigid.nve.g++.4

examples/rigid/log.20Apr18.rigid.poems.g++.1

examples/rigid/log.20Apr18.rigid.poems.g++.4

examples/rigid/log.20Apr18.rigid.poems2.g++.1

examples/rigid/log.20Apr18.rigid.poems2.g++.4

examples/rigid/log.20Apr18.rigid.property.g++.1

examples/rigid/log.20Apr18.rigid.property.g++.4