IsQuasiregularNearring( nr )  
A near-ring N is called quasiregular if all its elements are quasiregular.
The function IsQuasiregularNearring simply checks if all elements
of the near-ring nr are quasiregular and returns the according 
boolean value true or false.
gap> IsQuasiregularNearring( LibraryNearring( "V4", 4 ) ); true
GAP 3.4.4