Rename mc(1) to cols(1)

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

cols.1

@@ -0,0 +1,35 @@
+.TH COLS 1 sbase\-VERSION
+.SH NAME
+cols \- columnize output
+.SH SYNOPSIS
+.B cols
+.RB [ \-c
+.IR chars ]
+.RI [ file ...]
+.SH DESCRIPTION
+.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, 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 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 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 cols
+currently mangles files which contain embedded NULs.
+.B cols
+does not allow the user to set a default width in its environment.