ALF11 — The Alf 1.1 specification should reflect the latest version of fUML

The Alf 1.0.1 specification still references fUML 1.1, even though the latest version of fUML (at the time of the creation of this issue) is 1.2.1. Alf 1.1 should reflect the latest version of fUML at the time the new specification is completed (at least fUML 1.2.1, but, more likely, fUML 1.3).

Change fUML reference to v1.3

Actually, the resolution to issue ALF11-68 already updates the fUML version to 1.2.1. However, the fUML 1.3 RTF is now finishing its work, so it makes sense to further update the referenced fUML version to 1.3. This requires both changing the cited version under Clause 3 Normative References and changing certain sublause references throughout the document, since a number of new subclauses were added to the fUML 1.3 specification, changing the number of some old subclauses.