missing groups in getent if member list was empty).

Each OS gets its own password fields filled in (each of the 3 currently
supported are different).
Added FreeBSD-specific API code

Removed -Bgroup and --allow-shlib-undefined linker options
Define conditional 'RENAME' (see Makefile.am changes)
Check for shadow.h (FreeBSD doesn't have it)

Removed install-exec-hook (no longer necessary due to the above change).
Primary sample configs moved into OS-specific directories

assumed it was the first field in the struct which isn't so for FreeBSD

Updated for version 0.9

RPM installation information
Genericized "Test with" section

debug routines depend on it