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/Unannex.hs

@@ -22,12 +22,13 @@ import qualified Git.DiffTree as DiffTree
 import Utility.CopyFile
 import Command.PreCommit (lockPreCommitHook)
 
-cmd :: [Command]
-cmd = [withOptions annexedMatchingOptions $
-	command "unannex" paramPaths seek SectionUtility
-		"undo accidential add command"]
+cmd :: Command
+cmd = withOptions annexedMatchingOptions $
+	command "unannex" paramPaths SectionUtility
+		"undo accidential add command"
+		(commandParser seek)
 
-seek :: CommandSeek
+seek :: CmdParams -> CommandSeek
 seek = wrapUnannex . (withFilesInGit $ whenAnnexed start)
 
 wrapUnannex :: Annex a -> Annex a