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/RmUrl.hs

@@ -13,10 +13,10 @@ import Logs.Web
 import Annex.UUID
 import qualified Remote
 
-cmd :: [Command]
-cmd = [notBareRepo $
+cmd :: Command
+cmd = notBareRepo $
 	command "rmurl" (paramPair paramFile paramUrl) seek
-		SectionCommon "record file is not available at url"]
+		SectionCommon "record file is not available at url"
 
 seek :: CommandSeek
 seek = withPairs start