Fixed a few buggy tests for two-list functions in ControlCollections.Choice.fs.
Ignored a few failing compatibility tests for Patricia trie-based map and set types. These don't seem to be critical issues, and the failing enumerator tests for the map types (which fail because getting .Current before calling .MoveNext() _doesn't_ raise an exn) warrant some investigation into the compiler-generated implementations of the enumerator for 'seq'.
Implemented a couple of tests for the Lazy module.
Implemented State.List.init function.