The "Space Home" link now goes to Space-as-Thing

This should make it easier to edit the Space Page itself, which has been
annoying me.
Enabled Bootstrap Responsive mode

*Very* dangerous and tentative, but so far it seems to at least kind of
work.
Made the Editor cope decently with Responsive

Fought for a while, then discovered I had long-ago hard coded some
inappropriate widths that were getting in the way.  Now works adequately
for the moment.
Refactorings in RequestContext

Originally done for the now-aborted smallScreen mode, but the
refactoring is still likely correct in the medium term.
Release 0.3.11