Printing of objects that are not vectors nor matrices

[mikldk]

x <- ysym("x")
y <- ysym("y")
eq <- x^2 + 3*x + 4*y + y^4
eq

gives

## [1] x^2+3*x+4*y+y^4

It would be better if it was more clear that eq is a yac_symbol. For vectors and matrices this is more clear due to the {'s.

A suggestion:

## y: x^2+3*x+4*y+y^4