Log Message:
libcerf: updated to 1.7

libcerf-1.7:
- Option -DCERF_CPP allows to choose C++ compilation, which is useful
  because MS VisualStudio supports C++14, but not yet C99, and in
  particular does not suppotr complex.h under C.

libcerf-1.6:
- Migrated from automake to CMake.
- Corrected typos in man pages.