Test modify cone renf
==================

>>> from PyNormaliz import NmzCone, NmzResult, NmzModifyCone
>>> nf = [ "a4-5a2+5", "a", "1.9021+/-0.01" ]
>>> C = NmzCone(number_field=nf, cone=[[1,0],[0,1]])
>>> NmzResult(C,"ExtremeRays") == [[[[0, 1]], [[1, 1]]], [[[1, 1]], [[0, 1]]]]
True
>>> NmzModifyCone(C,"cone",[[-1,0]])
True
>>> NmzResult(C,"ExtremeRays") == [[[[0, 1]], [[1, 1]]]]
True