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This has the following benefits:

Simplifies the query execution stage API.
Eliminates the complexity of having both PlanStage::StageState::IS_EOF and PlanStage::isEOF.
Brings the stage interface in line with the style we are moving towards with the storage layer's SortedDataInterface::Cursor.

is depended on by

SERVER-18725 Use PlanExecutor::enqueue() in favor of PipelineProxyStage::pushBack()

is related to

SERVER-15218 Plan ranking EOF bonus should be given if root stage work() was IS_EOF, not if root stage isEOF() is true

SERVER-17635 Improve SortedDataInterface::Cursor API

related to

SERVER-19915 Cursor may indicate that it is not exhausted even though next getMore will close the cursor and return no results

SERVER-19947 Deadlock between aggregations with sorts on sharded collections and operations requiring MODE_X database locks