Define MAX_QUERY_ATTEMPTS

Prep for 1.1

libtool >= 1.5.2 is required.

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