BSL update sample class

[uremes]

Summary:

small modifications to BSL output, for example included method name and num simulations in the output sample and removed some unused inputs and code in the sample class. also the sample class took as input both (a) samples_all and burn_in to indicate how many samples should be removed and (b) outputs that were the samples with a burn in period removed. in this version outputs is not taken as input but created based on samples_all and burn_in in the sample class initialisation, same as we do in BOLFI sample.

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