-// (client) reads (and interpolates) the eye location from the database,
-// given a current time
-//int EntityFrame_FetchEye(entity_database_t *d, vec3_t eye, double time);
-// (client) fetchs an entity from the frame by index into the entity list
-//int EntityFrame_FetchEntityByIndex(entity_frame_t *f, entity_state_t *e, int index);
-// (client) fetchs an entity from the frame by entity number
-//int EntityFrame_FetchEntityByNumber(entity_frame_t *f, entity_state_t *e, int number);