- Reworked IFileSystem utility so that now it is noimplement/noextend. Clients should now extend from concrete class FileSystemUtility instead to better insulate them from future API changes.
- Reworked the resulting concurrency fixes - indexing and scanner discovery now synchronize on the project root as a scheduling rule. Original HEAD behaviour was to synch on the project's .settings folder for indexing, but that deadlocked with scanner discovery.
- Fixed remote indexing. Changes on HEAD that deprecated CodeReader broke the ability for remote translation units to provide the path to load the file content from. Added API to ITranslationUnit for this purpose.
