feature request: alignment setting

[philpennock]

Per TODO notes in table.go -- we should be able to set alignment on cells.

This should be a property stored, columns should be the main use-case, individual cells a second. The property side won't care, but the API will.

I suspect that we want two types of interface:

• row.AddCellWithOptions(item interface{}, options tabular.Options)
• tbl.SetOptions(location tabular.CellLocation, options tabular.Options)

The location approach can use 0 for "unspecified, so that it becomes tabular.CellLocation{Column: 2}. The option-setting logic then parses that to figure out where to set the properties.

Do we want options to be properties, or a lighter shim around them?

For the alignment:

• ALIGN_LEFT, ALIGN_RIGHT, ALIGN_CENTER
• ALIGN_NUMERIC ? What locale issues here?
• ALIGN_FUNCTION ... via just using a function, which satisfies an interface? Specifies offset into character-cell-width for using for alignment, for a given table cell, and so a simple implementation might search for the right-most "."

Probably use an interface, period, but have a type used for the ALIGN_foo constants, and the method upon that type use the value as input.