invoke more abstract print in non-compact case
invoke more abstract print in non-compact case

@simonschoelly identified this problem in
https://github.com/GiovineItalia/Compose.jl/pull/282#issuecomment-416537701
where calling show would lead to a stackoverflow error due to infinite
recursion. The solution is to explicitly invoke Base's abstract show
function when the non-compact form is requested to prevent the runaway
recursion.

dcjones/Compose.jl