Changes in version 0.2:
  - added autotools support (thanks to Philippe Théveny)
  - replaced the two separate header files mpcx.h and mpfrx.h by mpfrcx.h
  - renamed init2 to init
  - new functions and macros
    - get_deg (macro)
    - get_prec (macro)
    - out_str: replaces print
    - cmp
    - urandom
    - realloc

Version 0.1:
  - initial release