Tester file is built with "make" if enabled at configure time

 cmake -D SFCGAL_BUILD_TESTS=True <srcdir> # in top-level build dir

Run all tests with:

 ./standalone-regress-test-SFCGAL

Run specific tests with:

 ./standalone-regress-test-SFCGAL --run_test=TestSuite/Test

See more options with:

 ./standalone-regress-test-SFCGAL --help
