fixed message for --noplot option
--extra also create a good .tex file
a bestfit file is created even with unconverged chains
bug fix on sampler procedure
added a --minimal flag for info to only compute covmat/bestfit
it is possible to specify a prior center and variance for planck nuisance param
bug fix for handling empty lines in bao
fixed bug analyze for empty files
bug fix analyze, but no more bestfit from not converged chain
analyze legend compatible with matplotlib v1.1.0