Hist plot support nice xticks

- Added: Nice Xticks support for hist_angular
Histograms (Fig2) for Bays2009 dataset

- Added: Plots for histogram of error distribution and bias to nontarget for Bays2009.
Bootstrap fix for EM mixture with unique kappa

- Fix: Bootstrap evaluation works well now. Supports both allnontarget or sumnontarget CDF.
Changed Specific Stimuli EM fit to unique kappa one

- Fix: changed to fit the mixture model with unique kappa and all mixture components.
Changed Misbinding EM fit to unique kappa one

- Fix: changed to fit the mixture model with unique kappa and all mixture components.
Bootstrap generators to use all samples instead of just the sum

- Fix: Bootstrap generator now uses all samples bootstraps instead of sum mixt bootstrap. Modified reloaders accordingly
Changed error histograms to same format as Experimental data

- Fix: changed histograms so that we have the same form as the experimental data. Nice and great fit.