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+From Paul Zimmermann 1st September 2011:
+return the exact ternary value in mpc_div:
+- for directed rounding modes it is easy (assuming we are able to detect
+  exact cases)
+- rounding to nearest to n bits is equivalent to directed rounding to n+1 bits
+
 From Andreas Enge 31 August 2011:
 implement mul_karatsuba with three multiplications at precision around p,
 instead of two at precision 2*p and one at precision p