UI consistency: allow --force for where -f means force

git branch, checkout, clean, mv and tag all have an option -f to override
certain checks.  This patch makes them accept the long option --force as
a synonym.

While we're at it, document that checkout support --quiet as synonym for
its short option -q.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-tag.c

@@ -390,7 +390,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 		OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
 		OPT_STRING('u', NULL, &keyid, "key-id",
 					"use another key to sign the tag"),
-		OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
+		OPT_BOOLEAN('f', "force", &force, "replace the tag if exists"),
 
 		OPT_GROUP("Tag listing options"),
 		{