Add catv (separate applet instead of cat -v). Also cleanup cat.c comments,

the following of which (from cat.c) belongs in svn history instead of the
source code:

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * This is a new implementation of 'cat' which aims to be SUSv3 compliant.
 *
 * Changes from the previous implementation include:
 * 1) Multiple '-' args are accepted as required by SUSv3.  The previous
 *    implementation would close stdin and segfault on a subsequent '-'.
 * 2) The '-u' options is required by SUSv3.  Note that the specified
 *    behavior for '-u' is done by default, so all we need do is accept
 *    the option.
 */

coreutils/Makefile.in

@@ -14,6 +14,7 @@ COREUTILS-y:=
 COREUTILS-$(CONFIG_BASENAME)  += basename.o
 COREUTILS-$(CONFIG_CAL)       += cal.o
 COREUTILS-$(CONFIG_CAT)       += cat.o
+COREUTILS-$(CONFIG_CATV)      += catv.o
 COREUTILS-$(CONFIG_CHGRP)     += chgrp.o
 COREUTILS-$(CONFIG_CHMOD)     += chmod.o
 COREUTILS-$(CONFIG_CHOWN)     += chown.o