New command with corresponding man page. Includes the flags:

-s strip binary
-d create directory
-D create missing directories
-t DIR target directory
-m MODE permission bits
-o USER set owner
-g GROUP set group

Installed files are copied, and default mode is 755.

Signed-off-by: Mattias Andrée <maandree@kth.se>

README

@@ -42,6 +42,7 @@ The following tools are implemented:
 =*|o grep        .
 =*|o head        .
 =*|x hostname    .
+=*|x install     .
 =* o join        .
 =*|o kill        .
 =*|o link        .