Update docs

TODO

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-TODO list for busybox in no particular order. Just because something
-is listed here doesn't mean that it is going to be added to busybox,
-or that doing so is even a good idea. It just means that we _might_ get
-around to it some time. If you have any good ideas, please send them
-on in...
-
- -Erik
-
------------
-
-Possible apps to include some time:
-
-* group/commonize strings, remove dups (for i18n, l10n)
-
------------
-
-With sysvinit, reboot, poweroff and halt all used a named pipe,
-/dev/initctl, to communicate with the init process.  Busybox
-currently uses signals to communicate with init.  This makes
-busybox incompatible with sysvinit.  We should probably use
-a named pipe as well so we can be compatible.
-
------------------------
-
-Run the following:
-
-    rm -f busybox && make LDFLAGS+=-nostdlib 2>&1 | \
-	sed -ne 's/.*undefined reference to `\(.*\)..*/\1/gp' | sort | uniq
-
-reveals the list of all external (i.e., libc) things that BusyBox depends on.
-It would be a very nice thing to reduce this list to an absolute minimum, to
-reduce the footprint of busybox, especially when staticly linking with
-libraries such as uClibc.
-
------------------------
-
-Compile with debugging on, run 'nm --size-sort ./busybox'
-and then start with the biggest things and make them smaller...
-
------------------------
-
-xargs could use a -l option
-
-------------------------------------------------------------------
-
-libbb/unzip.c and archival/gzip.c have common constant static arrays and
-code for initializing the CRC array. Both use CRC-32 and could use
-common code for CRC calculation. Within archival/gzip.c, the CRC
-array should be malloc-ed as it is in libbb/unzip.c .