.noannex file

A top-level .noannex file will prevent git-annex init from being used in a
repository. This is useful for repositories that have a policy reason not
to use git-annex. The content of the file will be displayed to the user who
tries to run git-annex init.

This also affects git annex reinit and initialization via the webapp.
It does not affect automatic inits, when there's a sibling git-annex branch
already.

This commit was supported by the NSF-funded DataLad project.

Command/Reinit.hs

@@ -36,6 +36,6 @@ perform s = do
 		then return $ toUUID s
 		else Remote.nameToUUID s
 	storeUUID u
-	initialize' Nothing
+	initialize' (AutoInit False) Nothing
 	Annex.SpecialRemote.autoEnable
 	next $ return True