Rename mc(1) to cols(1)

There is an obvious name collision with the popular file manager
midnight commander.

Makefile

@@ -36,6 +36,7 @@ SRC = \
 	chroot.c   \
 	cksum.c    \
 	cmp.c      \
+	cols.c     \
 	comm.c     \
 	cp.c       \
 	cut.c      \
@@ -53,7 +54,6 @@ SRC = \
 	kill.c     \
 	ln.c       \
 	ls.c       \
-	mc.c       \
 	md5sum.c   \
 	mkdir.c    \
 	mkfifo.c   \

cols.1

@@ -1,35 +1,35 @@
-.TH MC 1 sbase\-VERSION
+.TH COLS 1 sbase\-VERSION
 .SH NAME
-mc \- multi-column
+cols \- columnize output
 .SH SYNOPSIS
-.B mc
+.B cols
 .RB [ \-c
 .IR chars ]
 .RI [ file ...]
 .SH DESCRIPTION
-.B mc
+.B cols
 reads each file in sequence and writes them to stdout,
 in as many vertical columns as will fit in
 .I chars
 character columns.
-If no file is given, mc reads from stdin.
+If no file is given, cols reads from stdin.
 .SH OPTIONS
 .TP
 .BI \-c " chars"
 specifies the maximum number of character columns to use
 (unless the input contains lines longer than
 .I chars
-characters).  By default mc tries to figure out the width
+characters).  By default cols tries to figure out the width
 of the output device, if that fails it defaults to 65
 chars.
 .SH BUGS
 This implementation of
-.B mc
+.B cols
 assumes that every byte is a character
 which takes up one column on the screen.
 It does not handle non-ASCII UTF-8 runes
 or TAB characters correctly.
-.B mc
+.B cols
 currently mangles files which contain embedded NULs.
-.B mc
+.B cols
 does not allow the user to set a default width in its environment.