22 December 2018: bug-fix release 2.0.2, for negative beta
04 December 2018: bug-fix release 2.0.1, for massive constituents
24 February 2015: version 2.0.0
21 February 2015: released 2.0-devel
27 January 2015: creating version 2.0-devel 
13 March 2014: first development version 1.0-devel