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/MetaData.hs

@@ -16,10 +16,10 @@ import Logs.MetaData
 import qualified Data.Set as S
 import Data.Time.Clock.POSIX
 
-cmd :: [Command]
-cmd = [withOptions metaDataOptions $
+cmd :: Command
+cmd = withOptions metaDataOptions $
 	command "metadata" paramPaths seek
-	SectionMetaData "sets or gets metadata of a file"]
+	SectionMetaData "sets or gets metadata of a file"
 
 metaDataOptions :: [Option]
 metaDataOptions =