rosie go: improve new suite wizard behaviour.

This gives a larger, maximizable window for editing the
suite info data (access-list, title, etc). It also makes
sure that the project metadata is correctly loaded for
extra compulsory variable addition.

The metadata for our standard rose-suite.info options has
also been improved.
address some feedback
Merge pull request #1338 from benfitzpatrick/rosie-go.new-suite-wizard-tweaks

rosie go: improve new suite wizard behaviour.