Clean up various confusions between modules and directories:

	* cvs.texinfo: In "are you sure you want to release" message,
	change module to directory.  CVS was changed some time ago.
	(Tags): "working copy of the module" -> "working directory".
	(Merging two revisions): Remove unnecessary text "that make up a
	module".
	(Recursive behavior): Change "module" to "directory".
	(Removing files): Likewise.
	(Tracking sources): Remove "a module" from titles.
	(Moving directories): Change "module" to "parent-dir".
	(Inside): Remove "of the module".
	(Inside): Change "module" to "dir".
	(Rename by copying): Change "module" to "dir".
	(Rename by copying): Remove "of the module".
	(Moving directories): "copy of the module" -> "checked out copy of
	the directory"; remove second "of the module".  Change "check out
	the module" to " check out again".
	(Moving directories): Remove "of the module".
	(Keyword substitution): "your working copy of a module" -> "a
	working directory".
	(CVS commands): Change "module" to "directory".
	(release examples): "module" -> "tc directory".
	(commitinfo): "relative path to the module" -> "directory in the
	repository".
	(verifymsg): Change "module" to "directory".
	(Updating a file): "working copy of a module" -> "working directory".