slightly better printing

SL.jl

@@ -73,7 +73,7 @@ zero(x::Mod) = Mod(x.mod)
 
 function inv(M::Array{Mod,2})
     d = det(M)
-    d ≠ 0*d || thow(ArgumentError("Matrix is not invertible!"))
+    d ≠ 0*d || throw(ArgumentError("Matrix is not invertible! $M"))
     return inv(det(M))*adjugate(M)
     return adjugate(M)
 end
@@ -177,7 +177,6 @@ end
 
 function main()
     parsed_args = parse_commandline()
-    println("Parsed args:")
 
     # SL(3,Z)
     # upper_bound = 0.28-1e-5