db setup: no user and sensible names

Without user setup your default user will be used, which is handy for
development. Every engine has a dummy app, we don't want their test/dev
databases clashing, so come up with some sensible naming. Dummy app
doesn't have a production environment, so no need to configure that.
scaffold: migrated the database for the DataVolume
doc: database bootstrap
rspec setup: ran rails g rspec:install

this makes sure that tests that rspec generates work, but lost some
customizations...
rspec setup: read and deleted generated comments
rspec setup: rails-related setup

that's where it's supposed to go, these are the lines I originally
pasted into spec_helper