Transformation of 2sls or 3sls equations
[xall,lx1,ly1,endoeq,nameinst,lindx1,lindy1]=exploeqs(neqs,lexo,endo,z,namez)
neqs = # of equations
lexo = list of independent variables in each equation
endo = list of dependent variables in each equation
z = matrix of values of the dependent variables
namez = matrix of names of the dependent variables
xall = matrix of the values of the instruments
lx1 = list of the exogenous variables for each equation
ly1 = list of the endogenous variables for each equation
endoeq = list of he names of the endogenous variables for each equation
nameinst = matrix of the names of the instruments
lindx1 = list of the indexes of exogenous variables for each equation
lindy1 = list of the indexes of endogenous variables for each equation