D7: editor multi-cursor support

Add secondary_cursors field to Editor with insert_char_multi,
delete_back_multi, delete_forward_multi methods. Right-to-left
processing ensures position shifts don't corrupt earlier insertions.

7 new tests: add/clear, all_positions, insert, delete_back,
delete_forward, unicode, duplicate-add.

local/recipes/tools/diffutils/source/man/cmp.1

@@ -0,0 +1,74 @@
+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.40.4.
+.TH CMP "1" "May 2017" "diffutils 3.6" "User Commands"
+.SH NAME
+cmp \- compare two files byte by byte
+.SH SYNOPSIS
+.B cmp
+[\fIOPTION\fR]... \fIFILE1 \fR[\fIFILE2 \fR[\fISKIP1 \fR[\fISKIP2\fR]]]
+.SH DESCRIPTION
+Compare two files byte by byte.
+.PP
+The optional SKIP1 and SKIP2 specify the number of bytes to skip
+at the beginning of each file (zero by default).
+.PP
+Mandatory arguments to long options are mandatory for short options too.
+.TP
+\fB\-b\fR, \fB\-\-print\-bytes\fR
+print differing bytes
+.TP
+\fB\-i\fR, \fB\-\-ignore\-initial\fR=\fISKIP\fR
+skip first SKIP bytes of both inputs
+.TP
+\fB\-i\fR, \fB\-\-ignore\-initial\fR=\fISKIP1\fR:SKIP2
+skip first SKIP1 bytes of FILE1 and
+first SKIP2 bytes of FILE2
+.TP
+\fB\-l\fR, \fB\-\-verbose\fR
+output byte numbers and differing byte values
+.TP
+\fB\-n\fR, \fB\-\-bytes\fR=\fILIMIT\fR
+compare at most LIMIT bytes
+.TP
+\fB\-s\fR, \fB\-\-quiet\fR, \fB\-\-silent\fR
+suppress all normal output
+.TP
+\fB\-\-help\fR
+display this help and exit
+.TP
+\fB\-v\fR, \fB\-\-version\fR
+output version information and exit
+.PP
+SKIP values may be followed by the following multiplicative suffixes:
+kB 1000, K 1024, MB 1,000,000, M 1,048,576,
+GB 1,000,000,000, G 1,073,741,824, and so on for T, P, E, Z, Y.
+.PP
+If a FILE is '\-' or missing, read standard input.
+Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.
+.SH AUTHOR
+Written by Torbjorn Granlund and David MacKenzie.
+.SH "REPORTING BUGS"
+Report bugs to: bug\-diffutils@gnu.org
+.br
+GNU diffutils home page: <http://www.gnu.org/software/diffutils/>
+.br
+General help using GNU software: <http://www.gnu.org/gethelp/>
+.SH COPYRIGHT
+Copyright \(co 2017 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
+.br
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+.SH "SEE ALSO"
+diff(1), diff3(1), sdiff(1)
+.PP
+The full documentation for
+.B cmp
+is maintained as a Texinfo manual.  If the
+.B info
+and
+.B cmp
+programs are properly installed at your site, the command
+.IP
+.B info cmp
+.PP
+should give you access to the complete manual.