Improve Calculator

[pfleck]

The Optimization.Calculator (used for RunCollectionFormulaModifier and ExpressionCalculator) can only return boolean, double or string values. To explicit convert the result to int, a toInt function is required.

Furthermore, the Calculator can only use bool, int, double and string values as variables. By introducing a new [] operator, also arrays (e.g., IntArray) can be used.

[pfleck]

r12091

• Added a toint and todouble function.
• Changed the casts to the a more intelligent Convert.ToDouble/Int to avoid unboxing issues e.g. when casting a boxed int to double. Note that Convert.ToInt32 has a slightly different behavior than a int-cast (rounds when converting double->int), but this does not break any compatibility since we never converted to int before.

[pfleck]

r12096 Added []-operator for accessing arrays. Note that a more generic implementation is difficult because there is no non-generic implementation of ValueTypeArray and casting to IEnumerable<object> does not work due to the generic constraint of ValueTypeArray.

[pfleck]

r12114 Updated parameter description of ExpressionCalculator and RunCollectionFormulaModifer to include the new functions.

[epitzer]

looks very good, thanks for the update

[mkommend]

r12719: Merged r12091, r12096 and r12114 into stable.