Clarify draft form handling

[florianm]

Feature

ODK Central has recently added form drafts, which complicate interaction a bit.

From the ODK forum:

I think the only one thing I struggled with when setting up RuODK was the fact that I was working with ODK forms that were still drafts and had not been published yet, and hence got empty tables when trying to read submissions. It may be worth re-emphasising this (although I see that publishing is indeed mentioned in your section describing the ODK Central setup)

• Add unpublished forms to a test case. What breaks?
• Expand documentation. What should users do / avoid / know? Where are the low-hanging ceiling beams users bump their head into?

[florianm]

Should be handled by test cases now. Form draft / publishing is nicely explained by ODK Central's front end, so unless ruODK implements these form management actions (out of scope IMHO), I wouldn't expect much confusion from this end.