Optimiser: Parsing of expressions

I added the new function infNormRadialPeak. However, it's not recognized. It crashes with Parsing failed!. I do not see a difference to other expressions.

According to line 180 it checks

if (success && iter != end) {
    std::cout << "Parsing failed!" << std::endl;
    throw new OptPilotException("Expression::parse()",
                                "Parsing failed!");
}

I think it should be !success and ìter == end instead. A first test confirms my proposal, i.e. it still works with e.g. sumErrSqRadialPeak but now also with infNormRadialPeak.