computes for the ideal ideal_name in the ring ring_name
a Groebner basis in the current ring, by applying the fractal walk
algorithm.
The main application is to compute a lexicographical Groebner basis
from a reduced Groebner basis with respect to a degree ordering. This
can be much faster than computing a lexicographical Groebner basis
directly.
Note:
When calling frwalk, the only permissible difference between the ring
ring_name and the active base ring is the monomial ordering.