improves test coverage of routine yac_fexchange_single_pointset_dble and yac_fexchange_single_pointset_real

* consistency is now checked by explictly exchanging information between processes using a shifting algorithm
* replaces algorithm that used a specific tag, which limited the maximum number of components

adds test for routine yac_cread_config_json, yac_cread_config_json_instance, yac_fread_config_json, and yac_fread_config_json_instance