Precise clicking now working with the polygonal triangle arrow, debugging diamond arrow even though same mechanism used. In progress of making nodes obey draw and z-order when clicking a stack of nodes to  select the top one. Selection box border now no longer increases in width when zooming. Fixed slight selection box mouse accuracy issue. refs #171
Precise clicking now working with the polygonal triangle arrow, debugging diamond arrow even though same mechanism used. In progress of making nodes obey draw and z-order when clicking a stack of nodes to  select the top one. Selection box border now no longer increases in width when zooming. Fixed slight selection box mouse accuracy issue. refs #171

rlugojr/cytoscape.js,soomin-maeng/cytoscape.js,soomin-maeng/cytoscape.js,KonstantinShemyak/cytoscape.js,rlugojr/cytoscape.js,cytoscape/cytoscape.js,cytoscape/cytoscape.js,KonstantinShemyak/cytoscape.js