formal: Fixes Licenses

[Sebastian Huber]

On 23.01.23 13:01, Andrew.Butterfield at scss.tcd.ie wrote:
> Patches to fix licenses for formal material are attached.
> 
> The main issue was missing/wrong SPDX identifiers 

Thanks, I checked it in.

With respect to the licensing, there is currently a mix of BSD-2-Clause 
and BSD-3-Clause with copyright Trinity College Dublin (www.tcd.ie). 
Since BSD-3-Clause is more restrictive, maybe this should be changed so 
that all files use BSD-3-Clause.

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