cmake problem with , instead of semi-colon in the ENVIRONMENT property for cmake tests

Hi, when I was testing the guix recipe, I found a problem with the PYTHONPATH defined in the hysop_tests.cmake file

  set_tests_properties(${test_name} PROPERTIES ENVIRONMENT "PYTHONPATH=$ENV{PYTHONPATH}:${HYSOP_BUILD_PYTHONPATH}")
  set_tests_properties(${test_name} PROPERTIES ENVIRONMENT "PYTHONPATH=$ENV{PYTHONPATH}:${HYSOP_BUILD_PYTHONPATH},LD_LIBRARY_PATH=$ENV{LD_LIBRARY_PATH}:${HYSOP_BUILD_PYTHONPATH},HYSOP_ENABLE_LONG_TESTS=${ENABLE_LONG_TESTS}")

first, I think the first line is redondant. In the second, according to there comma must be semi-colons. With this modificiation, pytest embedded in python finds the path to hysop. I did the fix in the branch fixSemiColonInEnvironvment4Test. Could someone confirm that it works, and merge it if you accept the fix Bests