[PATCH] passwd size reduction and request for testing: take 2

[Tito]

Hi,
This is take 2 of passwd size reduction.
I've fixed the errors pointed out by Rob Landley.
The program now acts more like the real passwd
on my linux box:
1) loop as long as a good (not easy to guess)  new password is typed (for normal user)
2) override obscure password checking for root
3) loop and retry on password retype mismatch.
4) use bb_do_delay in all errors related to asking for the old password in new_password() .
5) rip out -a switch (non standard: on my system it is -a -all), hope nobody complains.....
6) default to use salted passwords (more secure?!).
7) fix the license as suggested on the list.
8) code cleanup
9) more size reduction:
root at localhost:/dev/pts/0:/root/Desktop/busybox/loginutils# size passwd.o.orig
   text    data     bss     dec     hex filename
   3166       0     160    3326     cfe passwd.o.orig
   1952       4     289    2245     8c5 passwd.o

The patch is big and needs auditing and review by the list members.
So  i am posting it also as drop in replacement
to make code auditing easier.

Thanks to all for your help

Ciao,
Tito
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