+ <news date="2014 June 18.">
+ Preservation of stratified native validity
+ for context-sensitive computation on terms.
+ </news>
+ <news date="2014 June 9.">
+ strong qrst-normalization
+ for simply typed terms.
+ </news>
+ <news date="2014 April 16.">
+ lazy equivalence on local environments
+ addded as q-step to rst-computation on closures
+ (anniversary milestone).
+ </news>
+ <news date="2014 January 20.">
+ Parametrized slicing of local environments
+ comprises both versions of this operation
+ (one from basic_1, the other used in basic_2 till now).
+ </news>
+ <news date="2013 August 7.">
+ Passive support for global environments.
+ </news>
+ <news date="2013 July 27.">
+ Reaxiomatized β-reductum as in rt-reduction.