Add rank to the caprieval module output

[amjjbonvin]

The current capri.tsv generated output file would benefit from adding a rank column, either as first or second column.

[rvhonorato]

What should the ranking be based on, the same value that is being used to do the sorting or should it be another parameter?

[amjjbonvin]

The HADDOCK rank, i.e. based on the scoring function. Now you have to get the line number - 1 to figure out the rank. Having the rank in the file makes it easier to analyse the data

[rvhonorato]

So the rank should always be the score? Probably also good to have a something there to handle situations in which the score should be ranked descending/ascending.

[amjjbonvin]

So the rank should always be the score?

It should be the order in the capri.tsv file since we can specify something else than the score for the sorting (the `sortby` parameter). The default is the score

Probably also good to have a something there to handle situations in which the score should be ranked descending/ascending

Already there since it is a parameter in the `default.cfg` file (`ascending = true`) - but what happens if set to `false`? will it be descending then?