This makes make the migrated file functions available to parts of the code that don't have access to a File object. They still exist as wrappers in the File object to support remote calls.
Keepalives are now used to make sure the remote for the main process does not timeout while the thread remotes do all the work. The error messages for timeouts was also improved to make debugging easier.
* Major refactoring of the protocol layer to support this work.
* Fixed protocol issue that was preventing ssh errors (especially connect) from being logged.
