A step towards a Content-Security-Policy without inline scripts. The
scripts every page or many pages share now load from static files: the
error focus of base.html, the please-wait dialog, the sign-in forms'
password toggle and busy button, the jobs pages' reload while a job
runs, and the start of the job panel and of the VM list's state poll,
whose values come as json_script data. Cancel links go back through a
data-history-back attribute instead of a javascript: URL. The IE8
html5shiv/respond.js block, X-UA-Compatible and shrink-to-fit are gone:
no supported browser reads them.
