add rel_one_accuracy_bits() to a{r,c}

src/flint/flintlib/arb.pxd

@@ -79,6 +79,7 @@ cdef extern from "flint/arb.h":
     void arb_nonnegative_part(arb_t u, const arb_t x)
     slong arb_rel_error_bits(const arb_t x)
     slong arb_rel_accuracy_bits(const arb_t x)
+    slong arb_rel_one_accuracy_bits(const arb_t x)
     long arb_bits(const arb_t x)
     void arb_randtest_exact(arb_t x, flint_rand_t state, long prec, long mag_bits)
     void arb_randtest_wide(arb_t x, flint_rand_t state, long prec, long mag_bits)

src/flint/types/acb.pyx

@@ -1400,6 +1400,9 @@ cdef class acb(flint_scalar):
     def rel_accuracy_bits(self):
         return acb_rel_accuracy_bits(self.val)
 
+    def rel_one_accuracy_bits(self):
+        return acb_rel_one_accuracy_bits(self.val)
+
     def ei(s):
         r"""
         Exponential integral `\operatorname{Ei}(s)`.

src/flint/types/arb.pyx

@@ -2413,6 +2413,9 @@ cdef class arb(flint_scalar):
     def rel_accuracy_bits(self):
         return arb_rel_accuracy_bits(self.val)
 
+    def rel_one_accuracy_bits(self):
+        return arb_rel_one_accuracy_bits(self.val)
+
     def lambertw(s, int branch=0):
         r"""
         Lambert *W* function, `W_k(s)`. Either the principal