Backport updates from pastix

See merge request !5

Fixed and added required includes for ptscotch tests

See merge request !2

add FindFABULOUS.cmake

See merge request !3

for some packages that use pkgconfig: use the static list of headers and libraries for the sake of completeness

  - CPPCHECK_EXECUTABLE stores the cppcheck executable path
    - look for cppcheck executable in PATH env. var. or CPPCHECK_DIR/bin or CPPCHECK_BINDIR (env. var. or CMake variables)
  - CPPCHECK_VERSION stores the version

Add a hint to help Cmake to find the correct python version(python2)

See merge request !1