cf: avg.ls.cf convenience function implements averaging of LS and SL correlators in an ls object and adjusts nrStypes accordingly
matrixfit,effectivemass: use consistent colour scheme in plotting functions, take into account sign in plot.matrixfit
plot.matrixfit: add functionality to draw one-sigma error bands for the correlator fit function
Merge pull request #14 from kostrzewa/matrixfit-addons

matrixfit and effectivemass addons