the value of checkbox is posted only if it is checked, by default, it is "on"
destroy_version should be delete method
clear merge note
fix get_filename when downloading
configurable how to show webpage as external link: if enabled, any asset(content blob) registered with url but NO local copy stored on SEEK server will be shown as external link ( SYSMO-1632)
fix failed refactoring variable
test show_as_external_link_enabled