MAINT: Unit tests now print the Caosdb package versions.

tox.ini

@@ -10,4 +10,5 @@ deps=nose
     openpyxl
     xlrd == 1.2
     h5py
-commands=py.test --cov=caosadvancedtools -vv {posargs}
+commands=python3 unittests/print_versions.py
+    py.test --cov=caosadvancedtools -vv {posargs}

unittests/print_versions.py

+import caosdb as db
+import caosadvancedtools
+
+print(f"pycaosdb version: {db.__version__}")
+print(f"caosadvancedtools version: {caosadvancedtools.__version__}")