Fix the structure of the attacker model document

[Nat Sakimura]

Align with ISO Directives.

e.g., New structure:

Forward
Introduction
Warning
Notational conventions
1. Scope
2. Normative references
3. Terms and definitions
4. Symbols and abbreviations
5. Security goals
6. Attacker models
7. Attackers
8. Limitations
A.1 Acknowledgement
A.2 Bibliography
A.3 Changes

of which A.3 is to be removed after the FINAL vote.

[Nat Sakimura]

Merged in issue_640_attacker_model_iso (pull request #456)

fixed #640 - Fix the structure of the attacker model document

Approved-by: Dave Tonge Approved-by: Nat Sakimura

→ <<cset 5b840f1e7c12>>