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check if one object is contained in another

E IsIn F

where E and F are CoCoA objects.  For a precise description of
allowable objects, see the full online help entry.

The semantics of IsIn is explained in the following table:
   | POLY   IsIn  IDEAL   checks for ideal membership.              |
   | VECTOR IsIn  MODULE  checks for module membership.             |
   | OBJECT IsIn  LIST    checks if the list contains the object.   |
   | STRING IsIn  STRING  checks if the first string is a substring |
   |                      of the second one.                        |
                       IsIn operator