Posterior post-processing for individual mode

[lmauviard]

So far, all the posterior post-processing is done by drawing samples from *equal_weight.dat

This can be done on individual posterior modes by getting posterior samples from *post_separate.dat, an output of Multinest when using multi-mode. I suggest to add a possibility to do it in post-processing with a modes parameter when loading runs.

[thjsal]

The pull request connected to this was not merged yet, so the issue should not be yet closed?

[lmauviard]

Ups, wrong manipulation