Update primitives
Adapt to changes in index interface.
Fix index globals
Fix analysis debugging
Pass source argument to index-stop-collection.
Fix wrong argument order.
Distinguish between index primitives that return values and those that return key-value pairs.
Adapt analysis language to changes in index input.
Merge branch 'index-ds-refactor'

Conflicts:
	org.spoofax.meta.runtime.libraries/task/tasks.str