Extend the method get_knotinfo of the Link class to cover non-prime knots

src/doc/en/reference/knots/index.rst

@@ -7,5 +7,6 @@ Knot Theory
    sage/knots/knot
    sage/knots/link
    sage/knots/knotinfo
+   sage/knots/free_knotinfo_monoid
 
 .. include:: ../footer.txt

src/sage/databases/knotinfo_db.py

@@ -793,7 +793,7 @@ def _test_database(self, **options):
 
             sage: from sage.databases.knotinfo_db import KnotInfoDataBase
             sage: ki_db = KnotInfoDataBase()
-            sage: TestSuite(ki_db).run()    # long time indirect doctest
+            sage: TestSuite(ki_db).run()    # optional - database_knotinfo, long time, indirect doctest
         """
         from sage.knots.knotinfo import KnotInfo
         from sage.misc.misc import some_tuples

src/sage/knots/all.py

@@ -1,5 +1,4 @@
 from sage.misc.lazy_import import lazy_import
-from sage.features.databases import DatabaseKnotInfo
 
 lazy_import('sage.knots.knot', ['Knot', 'Knots'])
 lazy_import('sage.knots.link', 'Link')