Call nose differently and add test documentation

.travis.yml

@@ -77,7 +77,7 @@ matrix:
 
 script:
   - make ${MAKETARGET}
-  - cd test && nosetests -v
+  - cd test && python3 -m nose -v
 
 cache: pip
 

test/test_compile_lib.py

@@ -1,3 +1,7 @@
+"""
+Checks that the archive library can be successfully built for every scheme/implementation.
+"""
+
 import os
 import pqclean
 import helpers

test/test_functest.py

@@ -1,3 +1,7 @@
+"""
+Checks that the functional test program (functest) can be successfully built and executed for every scheme/implementation.
+"""
+
 import os
 import pqclean
 import helpers

test/test_license.py

@@ -1,3 +1,7 @@
+"""
+Checks that a LICENSE or LICENSE.txt file is present for every implementation of the specified scheme.
+"""
+
 import os
 import pqclean