FUNCTION: LieTools/srootlength
USAGE: srootlength(i,Gt); srootlength(i); srootlength(i,Gtype,rnk); 
SYNOPSIS: srootlength(i,Gt) that returns the length of the i-th simple root of Gt (following
  the conventions of Bourbaki). When called with a single argument i it is necessary to first
  initialize a global Lie algebra environment. 
EXAMPLE: 
> srootlength(1,G2);

                                  2

> srootlength(2,G2);

                                  6

SEE ALSO: 
