Changes

As indicated in #4046 it we need to revert part of #4155 since it is causing too many regressions for a minor release.
With proposed unit-checking in Dymola this reduces the warnings from 2301 to 1224 (Most - but not all are unit-related.)

Obviously many of them could be corrected, but I don't see that we have the resources to focus on that for this minor release.
The first models found were CompareTransformers, SeriesResonance in Modelica.Electrical.Analog.Examples.

Fix link to Holman2010 (#4199)

Fix and add ITEA links (#4196)

Fix broken links (#4202)

Remove redundant diagram text for most Analog examples

Remove diagram text of CompareTransformers

Update .mailmap file

Create by command

```
git log --raw | grep "^Author: " | sort | uniq | cut -d ' ' -f2- | sed 's/^//' > .mailmap
```

as reported by https://kevin.burke.dev/kevin/easy-maintenance-of-your-authors-file/

Remove duplicates in SignalNames of 10 examples of ModelicaTest (#4179)

See https://github.com/modelica/MAP-LIB_ReferenceResults/pull/6

Co-authored-by: Matthias Schaefer <matthias.schaefer@ltx.de>

Fix codespell exceptions (#4203)

* Fix typos
* Fix codespell exceptions

Implement improvement suggested by @tobolar