[nomerge] trace malloc

Author: irgolic

tox.ini

@@ -22,6 +22,8 @@ setenv =
     # Need this otherwise unittest installs a warning filter that overrides
     # our desire to have OrangeDeprecationWarnings raised
     PYTHONWARNINGS=module
+    # trace memory allocations
+    PYTHONTRACEMALLOC=1
     # Skip loading of example workflows as that inflates coverage
     SKIP_EXAMPLE_WORKFLOWS=True
     # set coverage output and project config