transferring ownership of Index to Singleton
Index-Singleton relationship updated, need to rewrite tests
Merge branch 'indexrefcount' of https://github.com/jackhall/Benoit into indexrefcount
rewriting index-singleton tests
rewrite of tests in progress
finished rewrite of Index
more rewritten tests
recompiling tests
tests almost compile again
tests compile
singleton tests pass, graph tests adjusted
test_graph almost compiles again
all tests pass