Level separation

Version 7.13.0

Bug fixes

• Avoid checking printed output in test of testing infrastructure.
• Use dsl_sym() instead of as.symbol() when constructing commands for combine() (#1340, @vkehayas).

New features

• Add a new level_separation argument to vis_drake_graph() and render_drake_graph() to control the aspect ratio of visNetwork graphs (#1303, @matthewstrasiotto, @matthiasgomolka, @robitalec).