emptycommit-12104
[examples] Replaced the old rounding mode macros (GMP_RNDN, etc.) by the new ones (MPFR_RNDN, etc.) in the *.c files; updated ReadMe file.
Copyright notice update: added 2018 with perl -pi -e 's/ (\d{4}-)?(2017)(?= Free Software)/ " ".($1||"$2-").($2+1)/e' **/*(^/) under zsh, reverting the ck-mparam and timings-mpfr.c files and the mbench directory under "tools" (not distributed with MPFR). Removed 2017 from the example in the doc/README.dev file.