[ENSWEB-2142] ZMenuOpen event for non-ajax zmenus
[ENSWEB-2142] ZMenuOpen event for non-ajax zmenus

Ensembl/public-plugins,muffato/public-plugins,muffato/public-plugins,muffato/public-plugins,muffato/public-plugins,Ensembl/public-plugins,Ensembl/public-plugins