Fixed output on -all options for analyzing chains

When the -all flag is used for analyzing a folder, the contour
coordinates were plotted to some data file. However, the headers were
indicating 3, 2 and 1 sigma contours, were it was in fact 2, 1 and 1
sigma. Now they output only the 2 and 1 sigma contours.
changelog updated to v1.2.4