Insert two scripts, ImportExceldata to import data from Excel files and ReplaceMissingValues to replace the missing values in a data sample

This information was only a duplicate of information. The stepNumber
is already available has the position of the step in the route list.

It's important to reraise, otherwise errors are hidden and very
hard to find

**kw has the problem that unexpected arguments are accepted
also fix 65ea4ef8 that was not reading min and stdev from first distribution

Also fix a problem that name was sometimes unitThroughput