Nyall Dawson b5864cd432 [FEATURE] Improve handling of defaults (inc provider default clauses,
literal defaults, and qgis expression defaults) and automatically
handle unique value constraints on layers

Add a new method QgsVectorLayerUtils::createFeature which returns
a new feature which includes all relevant defaults. Any fields
with unique value constraints will be guaranteed to have a value
which is unique for the field.

Currently only in use by the split feature tool.

Sponsored by Canton of Zug and the QGEP project
2016-11-16 14:19:24 +01:00
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