Test if x is a ScopedObject which is in the scope
of the themes specified in the constructor of this tester.
false if x is not a ScopedObject; true if
x is a ScopedObject and the set of test
themes is empty; or else true if the set of scoping topics for the
matches the context specified for this tester. If the boolean matchAll
property is set to true, then a match is determined if and only if every
scoping topic for x is in the context, otherwise a match
is determined if one or more scoping topics of x are found
in the context.
