Practical guide to app architecture

[mattyg]

Must include:

• code examples
• practical, terse explanation of how to use
• gotchas

Topics to cover:

• Composing zomes and DNAs into an app
  • DNA and app manifest formats
  • Coordinator swapping
  • cell provisioning strategies
    • Create -- always create a new cell
    • UseExisting -- requires existing cell under same key derivation tree (not implemented?)
    • CreateIfNotExists -- try UseExisting followed by Create (not implemented?)
    • CloneOnly -- defer instantiation until first clone. How is this different from Create with deferred and no effective instantiation?
  • Common flags
    • deferred -- don't create one until asked (not implemented? how do you ask?)
    • clone_limit -- how many clones can be created?

[pdaoust]

Broken out into #488, #489, and #490 [EDIT: and #508 and #510].

[pdaoust]

Closing now that it's broken into story-sized chunks.