Data frame Normalization for Unit Tests
Normalizes a data.frame with respect to column types. This is necessary for comparing data.frames written to Excel and then read from Excel. Excel does not know e.g. factor types. Factor variables in fact are written to Excel as ordinary strings. Therefore, when read back in to R, they are treated as character variables.
logicalspecifying if infinites should be replaced with
NA; this is used because Excel does not support infinites
Returns a normalized