[PATCH] passwd size reduction and request for testing: take 4

[Tito]

Hi,
This is take 4 of passwd size reduction (take somehow didn't make it to
the list, maybe the size was too big ?).
and just adds a minor fix (see 9) and a feature (see 10).
I've fixed the errors pointed out by Rob Landley in v.2.
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) Don't ask for old password again if obscure or retype fails.
10) Allow max 3 retries.
Size reduction is:
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
  1973       4     289    2266     8da loginutils/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 in advance  to all for your help,

Ciao,
Tito

PS: Sorry for the resend maybe my mail client or the my provider's snmp are messed up. 
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