Prompted by Stathis Kamperis.
Changes:
* New functions
+ mpc_set_dc, mpc_set_ldc, mpc_get_dc, mpc_get_ldc for
converting between mpc type variables and C variables of
type double _Complex or long double _Complex
+ mpc_sin_cos, computing simultaneously the sine and cosine
* Speed-ups
+ mpc_pow_si through binary exponentiation
+ mpc_pow_z when the exponent fits in a long
+ mpc_tan through the use of mpc_sin_cos
* Bug fixes
+ trigonometric functions: infinite loop due to overflow for large arguments
+ exp: close to infinite loop for argument close to 0
+ sqrt: close to infinite loop for argument close to 1
+ add_si: replaced macro by function, since the macro evaluated the same expression twice
* Logging feature for debugging
./configure --enable-logging
#include "mpc-log.h" instead of #include "mpc.h"
* Minimally required library versions: gmp 4.3.2, mpfr 2.4.2
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