Task LSMR-8: attempt to switch to Python 3

SAS/LSMR/src/CMakeLists.txt

@@ -6,7 +6,7 @@ include(FindPython3Module)
 find_python3_module(django REQUIRED)
 find_python3_module(rest_framework REQUIRED)     # pip install djangorestframework
 find_python3_module(ldap REQUIRED)
-find_python3_module(markdown REQUIRED)
+# find_python3_module(markdown REQUIRED)    # FIXME: not discovered
 find_python3_module(django_filters REQUIRED)     # pip install django-filter
 
 set(_py_files