Moved away from a map of flags to storing config directly in the AnnexState
structure. Got rid of most accessor functions in Annex.
This allowed supporting multiple --exclude flags.
* bugfix: Running `move --to` with a remote whose UUID was not yet known
could result in git-annex not recording on the local side where the
file was moved to. This could not result in data loss, or even a
significant problem, since the remote *did* record that it had the file.
* Also, add a general guard to detect attempts to record information
about repositories with missing UUIDs.
