updated vc_forces_numer_deriv to use particle names that are 24 characters
two corrections pointed out by Steve Stuart (one a bug fix for kJ/mol)
fixed comment at tope of get_model_NBC_methods.f.frag
added vc_config_ener_forces to repo and distribution
added vc_forces_delta to repo and distribution
added readme for vc_config... with periodic box support
added missing $(strip ) around MODEL_NAME in Makefile.Model_Drivers
clean up in standard.kim
minor clean up in test_legos/README
add _f to kim_api_free() call in vc_config_ener_forces
added vc_forces_delta to .gitignore
fixed examples-clean target in Makefile
made some minor updates to model_El_PF_Template.F90
added ex_model_Cu_PF_Johnson and the associated template
added free_cluster_CLUSTER_memory---A F90 Test that manages its own memory
added notes about sign conventions to standard.kim
cleaned up formatting for the KIM_API_print() routine
update to test_EXAMPLES.README
added code for NEIGH_RVEC_H
updated openkim-api-introduction.*