refs #1912

refs #1912
* ssh-access tweaked to emphasize need for user to use their own user name and not 'you' and changed example ssh config to use *.qr1hi to *.arvados
* tutorial-firstscript suggests using nano to edit files instead of leaving the user hanging
* Fixed inconsistent keep locators for manifests caused by removal of +K@qr1hi from locators
* Removed +K@qr1hi from all locators used in examples