template <typename Type>
CSVTabIns &CSVTabIns::insert(Type const &value):

If d_idx == d_format.size() ignore formats and insert value as is

determine the FMT to use (extraFMT or d_format):
FMT:
        left:   use left, setw, setpos and insert
        right:  use right, setw, setpos and insert
        center: configure an ostringstream with width and position and insert
                value. Then trim value -> length.
                if length < width: pre- and append spaces
                insert value with setw(width)

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CSVTabIns &operator<<(CSVTabIns &tab, FMT const &fmt)

        if FMT align == HLINE: insert the hline according to fmt
        otherwise: cp fmt to d_extraFMT and set d_useExtraFMT true
        hlines are at most inserted until (including) the table's lat col.
        if the #cols == 0 then nothing is inserted

    if fmt.width() == 0, then fmt.nCols() specifies the #columns to use
        (if nCols() + d_idx >= d_format.size() then all remaining columns are
        used).
    if (fmt.width() != 0, then that width is used for the combined fmt.nCols
        columns starting at d_idx


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CSVTabIns &operator<<(CSVTabIns &tab, FMTFunCH align)

    align =
        FBB::center: copy the next fmt to extraFMT and set align to CENTER.
        FBB::hline:  use the next fmt specs to insert a hline, and ++d_idx

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CSVTabIns &operator<<(CSVTabIns &tab, std::ios_base &(*func)(std::ios_base &))

        std::left, std::right: used only for the next column insertion
                    (via d_extraFMT)
        other manipulators (like hex etc): are inserted and
                    remain active until this row ends

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