Version 3.3.1

improvements of PGEVM for periodic correlators
added a double bootstrap routine for 'cf' called double_bootstrap.cf
added a new interface for 'gevp.hankel' which evaluates as a function of 'n', the matrix size. The new interface is called 'bootstrap.pgevm', which also acts on the double bootstrap data, if available
'pgevm2effectivemass' can also deal with the double bootstrap data to estimate the uncertainty for the media.
added the oblique Lanczos method 'bootstrap.lanczos' for the analysis of Euclidean correlation functions 'bootstrap.lanczos' also works with double bootstrap
'gevp.hankel' received some more functionality
'plot.effectivemass' has a new optional parameter 'xshift' to shift data points in x-direction for legibility.

Version 3.2.1

fix problems with roxygen docu in 'correlators_key_meson_3pt' and 'cf_key_meson_3pt'
faster implementation of 'plotwitherror'
allow to plot a bootstrap nlsfit on top of existing plot
Add some tests for 'computeDisc' function