A new accounts.library for envoy, V1.0

Envoys accounting system has a nice GUI but is rather braindead otherwise,
because it stores user and group informations in iff files - which makes
it incompatible with other software like muFS or AmiTCP - and is quite
insecure because it stores the passwords *unencrypted* !!!

So I have written a new accounts.library that reads user and group info
from passwd & Multiuser.group files (compatible with muFS 1.5).

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2242    4312  52.0% -lh5- acad Jan  3  1994 accounts.library
[generic]                 1043    2017  51.7% -lh5- 6614 Jan  4  1994 read.me
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    3285    6329  51.9%            Jan  6  1994