New attribute: CKA_ATTRIBUTES

[Michael StJohns <msj@nthpermutation.com>]

I'm getting into a bit of feature creep here, but I've often wished for 
an easier programmatic way to determine which attributes were applicable 
to which object.   Here's one approach.

<text>

#define CKA_ATTRIBUTES   (<toBeAssigned> | CKF_ARRAY_ATTRIBUTE)

Data type is CK_ATTRIBUTE_TYPE_PTR

typedef  *CK_ATTRIBUTE_TYPE CK_ATTRIBUTE_TYPE_PTR;   // Needs to be 
added to CK_ATTRIBUTE_TYPE def

This is a read-only, non-sensitive attribute present on all or none of 
the objects in a token.  If present it contains an array of 
CK_ATTRIBUTE_TYPE representing the complete set of valid attributes of 
that object.  If an attribute may be used for for an object, regardless 
of the purpose or sensitivity of that attribute, it must be included in 
the set for that object.

</text>

It may be that we define two of these, one for all valid attributes, and 
one for attributes actually present.