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/View.hs

@@ -17,9 +17,9 @@ import Types.View
 import Annex.View
 import Logs.View
 
-cmd :: [Command]
-cmd = [notBareRepo $ notDirect $
-	command "view" paramView seek SectionMetaData "enter a view branch"]
+cmd :: Command
+cmd = notBareRepo $ notDirect $
+	command "view" paramView seek SectionMetaData "enter a view branch"
 
 seek :: CommandSeek
 seek = withWords start