Make absoluteValue inferred by default

Fixes modelica#3631.

chapters/annotations.tex

@@ -1476,16 +1476,20 @@ \section{Graphical User Interface}\label{annotations-for-the-graphical-user-inte
 
 A simple type or component of a simple type may have:
 \begin{lstlisting}[language=modelica]
-/*literal*/ constant Boolean absoluteValue = true;
+/*literal*/ constant Boolean absoluteValue;
 \end{lstlisting}%
 \annotationindex{absoluteValue}
 
-If \lstinline!false!, then the variable defines a relative quantity, and if \lstinline!true! an absolute quantity.
+If \lstinline!false!, then the component defines a relative quantity, and if \lstinline!true! an absolute quantity.
+By default, the \lstinline!absoluteValue! status is inferred by the tool.
+
+When converting between units (e.g., in plots and where parameters are edited), the unit offset must be ignored for relative quantities.
+If the \lstinline!absoluteValue! of a component is neither determined by annotation nor inference, unit conversions that would differ depending on \lstinline!absoluteValue! cannot be performed.
 
 \begin{nonnormative}
-When converting between units (in the user-interface for plotting and entering parameters), the unit offset must be ignored for a variable defined with annotation \lstinline!absoluteValue = false!.
-This annotation is used in the Modelica Standard Library, for example in \lstinline!Modelica.Units.SI! for the type definition \lstinline!TemperatureDifference!.
-For most types there is no unit offset and the annotation is not needed for them.
+For most quantities there are no units with offset, and the annotation is not needed.
+For a component where unit conversions involving offsets could be of interest (mainly temperatures), ensuring that \lstinline!absoluteValue! is determined by an annotation (typically by means of using a type where it has been specified) may reduce impact of quality-of-implementation in tool ability to infer \lstinline!absoluteValue!.
+Example applications of this annotation can be found among the type definitions in the \lstinline!Modelica.Units! package of the Modelica Standard Library, such as \lstinline!TemperatureDifference!.
 \end{nonnormative}
 
 A model or block definition may contain: