Filter a use with properties if a name (through nabl-name) already contains an existing use annotation.
did todos in import lookups
Merge branch 'master' of git@github.com:metaborg/runtime-libraries.git
avoid term instructions
this resolves an ambiguity when a single term argument is a tuple, 
e.g. produce (&1, &2)
task for list lengths
improvements for lists
fixed bug in equality check
updated generated files
fix in get-property (get the first property, not all)
Merge branch 'master' into filtering-use

Conflicts:
	org.spoofax.meta.runtime.libraries/analysis/resolve.str
	org.spoofax.meta.runtime.libraries/nabl/collect.str
Remove debugging.
Cleanup.
special case where results are inserted already
Merge branch 'master' into filtering-use
Move annotation utilities to separate file.
Added rules to work with barriers.
Implement handling of barriers.
Strip barriers in returned parent URIs.
Fixed single imports.
Add some TODO’s and comments.