- Areas with same tabs are put in a column/row automtically. Move preferred size constraint from Area to the column/row. This avoids a "spring" effect of the

quadratic solver if multiple Areas are in the same column/row.
- Replace GetString by ToString.
- some clean up



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40941 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/libs/linprog/Constraint.h

@@ -64,8 +64,7 @@ public:
 			bool				IsValid();
 			void				Invalidate();
 
-								operator BString() const;
-			void				GetString(BString& string) const;
+			BString				ToString() const;
 			void				PrintToStream();
 
 								~Constraint();

headers/libs/linprog/LinearSpec.h

@@ -129,8 +129,7 @@ public:
 			ResultType			Result() const;
 			bigtime_t			SolvingTime() const;
 
-			operator BString() const;
-			void				GetString(BString& string) const;
+			BString				ToString() const;
 
 	const	ConstraintList&		Constraints() const;
 	const	VariableList&		UsedVariables() const;

headers/libs/linprog/Variable.h

@@ -35,8 +35,7 @@ public:
 			const char*			Label();
 			void				SetLabel(const char* label);
 
-								operator BString() const;
-			void				GetString(BString& string) const;
+			BString				ToString() const;
 
 			Constraint*			IsEqual(Variable* var);
 			Constraint*			IsSmallerOrEqual(Variable* var);
@@ -54,7 +53,7 @@ public:
 			//! delete it yourself!
 			void				Invalidate();
 
-								~Variable();
+	virtual						~Variable();
 
 protected:
 								Variable(LinearSpec* ls);