Add norns_access_rights_t

    const char* b_nsid;     /* namespace ID for this backend (e.g. nvm01, tmpfs02, ...) */

    int         b_type;     /* backend type */

    const char* b_mount;    /* mount point */

    size_t      b_quota;    /* backend capacity (in megabytes) allocated to the job for writing */

    size_t      b_quota;    /* backend capacity (in megabytes) for writing data */

} norns_backend_t;

/* Job access rights descriptor */

typedef struct {

    const char* r_nsid;     /* namespace ID */

    size_t      r_quota;    /* job's quota */

} norns_access_rights_t;

norns_backend_t NORNS_BACKEND(const char* nsid, norns_flags_t flags, 

                              const char* mount_point, uint32_t quota);