Merge branch 'QPR-10078' into 'master'

QPR-10078 Parallel test runner

Closes QPR-10078

See merge request qs/quantlib!34

Author: pcaspers

ql/userconfig.hpp

@@ -106,7 +106,7 @@
 
 /* Define this to enable the parallel unit test runner */
 #ifndef QL_ENABLE_PARALLEL_UNIT_TEST_RUNNER
-#    define QL_ENABLE_PARALLEL_UNIT_TEST_RUNNER
+//#    define QL_ENABLE_PARALLEL_UNIT_TEST_RUNNER
 #endif
 
 #endif