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/Map.hs

@@ -25,10 +25,10 @@ import qualified Utility.Dot as Dot
 -- a link from the first repository to the second (its remote)
 data Link = Link Git.Repo Git.Repo
 
-cmd :: [Command]
-cmd = [dontCheck repoExists $
+cmd :: Command
+cmd = dontCheck repoExists $
 	command "map" paramNothing seek SectionQuery
-		"generate map of repositories"]
+		"generate map of repositories"
 
 seek :: CommandSeek
 seek = withNothing start