Changes in version 0.5.1:
  - New functions:
    - mpc_set_fr_fr
    - mpc_real, mpc_imag
    - mpc_arg, mpc_proj
  - New macros:
    - version number: MPC_VERSION_MAJOR, MPC_VERSION_MINOR,
      MPC_VERSION_PATCHLEVEL, MPC_VERSION_STRING
    - references to number parts: mpc_realref and mpc_imagref
  - Test framework rewritten
  - Configure checks for recent gmp (>= 4.2.2) and mpfr (>= 2.3.1)
    libraries
  - New configure options: --with-gmp-lib, --with-gmp-include,
     --with-mpfr-lib, and --with-mpfr-include
  - Export declarations for MSWindows, makefile.vc updated (thanks to
    Mickael Gastineau)
  - Optimisations:
    - mul_fr, sin, cos
  - Bug fixes:
    - configure looks for gmp first, then for mpfr
    - cos, div, div_fr, fr_sub, mul_fr, set_fr, sqr
    - fix handling of special values: exp, log, mul, norm, sqr, sqrt

Changes in version 0.5 ("Aconitum neomontanum"):
  - Support for autotools
  - New functions:
     - logarithm
     - trigonometric functions: cos, tan
     - hyperbolic functions: cosh, sinh, tanh
  - Bug fixes:
    - sqrt with directed rounding