Add UTF-8-delimiter-support to cut(1)

Now you can specify a multibyte-delimiter to cut, which should
definitely be possible for the end-user (Fuck POSIX).
Looking at GNU/coreutils' cut(1)[0], which basically ignores the difference
between characters and bytes, the -n-option and which is bloated as hell,
one has to wonder why they are still default. This is insane!
Things like this personally keep me motivated to make sbase better
every day.

[0]: http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=blob;f=src/cut.c;hb=HEAD
     NSFW! You have been warned.

README

@@ -22,7 +22,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =* comm            yes                             none
 =  cp              no                              -H, -i, -L
 =* cron            non-posix                       none
- * cut             yes                             none
+#* cut             yes                             none
 =  date            yes                             none
 =  dirname         yes                             none
 =  du              no                              -H, -L, -x