Capitalize for consistency
Fix inverted use of resources
getItemset requires relevant control

- following bug in XFormsToSchema
- checked that callers don't call if the control is non-relevant
- small refactoring
- fixed incorrect comment
Fix #787 "xxf:default result is ignored in XBL mirror instance"

- xforms-model-construct: support param to specify whether to RRR
- XBL mirror: run initial RRR on initial copy of instance when model is initialized
- small refactoring of instance extraction
Fix #786 "xxf:default doesn't run in section template"

Depends on #787.

- rewrite xxf:default XPath to only run in "new" mode
- when initializing, explicitly re-run RRR with defaults when needed
xf:recalculate: support xxf:defaults="true" with xxf:deferred="true"