Function: bnfsunit
Section: number_fields
C-Name: bnfsunit
Prototype: GGp
Help: bnfsunit(bnf,S): compute the fundamental S-units of the number field
 bnf output by bnfinit, S being a list of prime ideals. res[1] contains the
 S-units, res[5] the S-classgroup. See manual for details

