Changes

Add links for MCP-0027

Removing Modifications (MCP-0009) (#3167)

* Create README.md
  * Add from old svn-server
  * Added experience in Dymola.
  * Added user experience
  * As discussed at the meeting.
  * Clarified experience.
  * Removed empty-variant. The meeting otherwise found it ok.
  * Add semantics of break.
  * Clarify that it is legal despite the rules for balanced models.
* Update chapters/inheritance.tex
* Update RationaleMCP/0009/README.md
* Correct rule for modifiers so that we can add equations in modifiers on base-classes.
Co-authored-by: Elena Shmoylova <eshmoylova@users.noreply.github.com>

Selective Model Extension (with specification text) (#3166)

MCP-0032: Initial commit.
* MCP0032: Added summary of the discussions and decisions of the 99th Modelica Design Meeting.
* MCP0032: Finished summary of the 99th Modelica Design Meeting.
* MCP0032: Added next examples library version with final deselection syntax.
* MCP0032: Added summary of the discussions and decisions at the 100th Modelica Design Meeting.
* MCP0032: Added next examples library version with final deselection syntax.
* MCP/0032: Update with latest feedback from the MAP-Lang meeting on 2021-09-18 and Elena Shmoylova (mostly clarification of rule 2.1 of "Semantic rules"-Section: deselected components must be models, blocks or connectors and deselecting a component also deselects all its connections).
* Incorporated feedback from Leonardo Laguna Ruiz and Henrik Tidefelt (Wolfram Research, Inc., [System Modeler](https://www.wolfram.com/system-modeler/)) and Elena Shmoylova (Waterloo Maple Inc.) given on [GitHub](https://github.com/modelica/ModelicaSpecification/issues/3005), resulting in the new _"Non-normative explanation of some interesting consequences of the semantic rules"_ Section.
* Correction annotation->annotation-clause outside of grammar-chapter.
One related to MCP - rest unrelated; so we might cherry pick and add them to master.
Co-authored-by: Christoff Bürger <Christoff.Buerger@gmail.com>
Co-authored-by: Elena Shmoylova <eshmoylova@users.noreply.github.com>
Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

Update chapters/equations.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

Add links for MCP-0027

Removing Modifications (MCP-0009) (#3167)

* Create README.md
  * Add from old svn-server
  * Added experience in Dymola.
  * Added user experience
  * As discussed at the meeting.
  * Clarified experience.
  * Removed empty-variant. The meeting otherwise found it ok.
  * Add semantics of break.
  * Clarify that it is legal despite the rules for balanced models.
* Update chapters/inheritance.tex
* Update RationaleMCP/0009/README.md
* Correct rule for modifiers so that we can add equations in modifiers on base-classes.
Co-authored-by: Elena Shmoylova <eshmoylova@users.noreply.github.com>

Selective Model Extension (with specification text) (#3166)

MCP-0032: Initial commit.
* MCP0032: Added summary of the discussions and decisions of the 99th Modelica Design Meeting.
* MCP0032: Finished summary of the 99th Modelica Design Meeting.
* MCP0032: Added next examples library version with final deselection syntax.
* MCP0032: Added summary of the discussions and decisions at the 100th Modelica Design Meeting.
* MCP0032: Added next examples library version with final deselection syntax.
* MCP/0032: Update with latest feedback from the MAP-Lang meeting on 2021-09-18 and Elena Shmoylova (mostly clarification of rule 2.1 of "Semantic rules"-Section: deselected components must be models, blocks or connectors and deselecting a component also deselects all its connections).
* Incorporated feedback from Leonardo Laguna Ruiz and Henrik Tidefelt (Wolfram Research, Inc., [System Modeler](https://www.wolfram.com/system-modeler/)) and Elena Shmoylova (Waterloo Maple Inc.) given on [GitHub](https://github.com/modelica/ModelicaSpecification/issues/3005), resulting in the new _"Non-normative explanation of some interesting consequences of the semantic rules"_ Section.
* Correction annotation->annotation-clause outside of grammar-chapter.
One related to MCP - rest unrelated; so we might cherry pick and add them to master.
Co-authored-by: Christoff Bürger <Christoff.Buerger@gmail.com>
Co-authored-by: Elena Shmoylova <eshmoylova@users.noreply.github.com>
Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

Update chapters/equations.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>