Horizontal stacking for tabarrays.

        Stack tabarray(s) in `new` to the right of `self`.

        **See also**

                :func:`tabular.tabarray.tab_colstack`, 
                :func:`tabular.spreadsheet.colstack`

def colstack(self, new, mode='abort'):
        """
        Horizontal stacking for tabarrays.

        Stack tabarray(s) in `new` to the right of `self`.

        **See also**

                :func:`tabular.tabarray.tab_colstack`, 
                :func:`tabular.spreadsheet.colstack`

        """
        if isinstance(new,list):
            return tab_colstack([self] + new,mode)
        else:
            return tab_colstack([self, new], mode)