#10 Make crosstab group totals (column and row) customizable

[Sergey Starosek]

DJ 3.0.7-b7

Now the only way to add column/row totals to the crosstab is to provide boolean flag showTotal in the addRow/addColumn methods.
This generates string like "Total ROW_TITLE" which can't be localized (see Dj2JrCrosstabBuilder#createRowTotalHeader).

It would be nice to make it possible to provide custom row/group total header and possible make it localized using $R{} references.