started converting to use optparse-applicative

This is a work in progress. It compiles and is able to do basic command
dispatch, including git autocorrection, while using optparse-applicative
for the core commandline parsing.

* Many commands are temporarily disabled before conversion.
* Options are not wired in yet.
* cmdnorepo actions don't work yet.

Also, removed the [Command] list, which was only used in one place.

Command/Indirect.hs

@@ -22,10 +22,10 @@ import Annex.CatFile
 import Annex.Init
 import qualified Command.Add
 
-cmd :: [Command]
-cmd = [notBareRepo $ noDaemonRunning $
+cmd :: Command
+cmd = notBareRepo $ noDaemonRunning $
 	command "indirect" paramNothing seek
-		SectionSetup "switch repository to indirect mode"]
+		SectionSetup "switch repository to indirect mode"
 
 seek :: CommandSeek
 seek = withNothing start