specify WEP individually like alignment

[igolotin]

Text alignment could be specified individually for each column. table.columns.alignment accept iterable containing alignment for each column.

It would be handful to width_exceed_policy in the same way. So you could mark some columns to be preserved and other columns to be truncated.

[pri22296]

Currently, the WEP is applied to the columns as well as the row header. If we go via the alignment approach, there needs to be a proper way to specify header properties.
This also applies to alignment itself. It seems currently there is no way to control the row header alignment.