Create a custom formatter for tables

[GregorCH]

The formatter class should be representable as XML element tree. It should be able to do the following:

• allow to transpose the resulting data frame
• reorder and delete columns that are not necessary (this can be done in one step by keeping a list of the necessary columns)
• allow to rename the axes. The names must pass the tex-conversion.
• allow to format the precision for individual columns.

[fschloesser]

This becomes relevant as rubberband should be improved.

[GregorCH]

I would not expect that this is happening soon. Rough formatting is already available through format strings.

[fschloesser]

As a preliminary step it would then also be nice to have formatstrings for the individual compare columns and the aggregations.

[GregorCH]

Aggregations (should) use the same formatting that the corresponding columns use. The Evaluation itself has an attribute comparecolformat that you can use for compare columns.

[fschloesser]

Okay, that seems to be broken then. The getColumnFormatter method still uses thelevel and seems to scramble up a colindex with more than one entry

[fschloesser]

I'll fix it