Merge pull request #3 from adlnet/master

Sync up!
Section 4.0 - 4.1.2.3 Edits

Generally, all sections within 4.0 should be rewritten to have a particular order to them.  Description should be first, and be text only.  If Rationale is needed, it would follow. The Details section should have any Testing Requirements as bullet points that can stand alone.  The Details sections should have the Properties tables as well. Some Details sections end up with sub-sections of their own, and will have different labels.  Eliminated "flavors" of objects within type field in tables i.e. account object.

Functional change - the MUST NOT instead of SHOULD NOT for IFIs used as Group ids and vice versa - can anyone shed light on how the two could co-exist to justify the SHOULD?
Reverted Agent/Group id req back to SHOULD NOT
Merge pull request #223 from andyjohnson/master

Section 4.0 - 4.1.2.3 Edits