Added missing experiment annotation.

This is for #250
Changed uses annotation

This is for #250. OpenModelica needs multiple entries in one uses annotation as opposed to two separate uses annotation.
Removed IntegerSum

This is for #250. The block was nowhere used.
Removed UnoccupiedOn

This is for #250. The block was nowhere used.
Added StopTime

This is for #250.
Improved documentation.

This closes #264.
This commit also adds extends Modelica.Icons.Function to render the
icon properly.
Merged Annex60 library.
Merged Annex60
Merged Annex 60
Updated medium model for #265
Fixed documentation error for #267.
Merge branch 'master' into Annex60Sync
Updated reference results
Merge pull request #265 from lbl-srg/Annex60Sync

Annex60 sync
Updated release notes.
Changed parameters of solids from public to protected.
Reverted last commit

This was required as protected variables were accessed in the room model.
Merged Annex60 library.
Accepted new reference results
Removed duplicate parameter declaration.

Removed parameter m1_flow_nominal, as this parameter is already
declared in the base class.