test-nis-schema-bdb2 to start a server using the NIS-LDAP
schema.

Modified by me to dn_*() and attr_*() functions and to use
uidObject and to handle search scopes better.  Could use some
more work.  A fun project for anyone wanting to learn how
backends work.
Modified dn_parent and dn_rdn to accept be=NULL (to bypass
be_issuffix check).  These functions should be generalized
and moved to -lldap.  A project for another day.

'make bdb2' tests only BDB2
'make ldbm' tests only LDBM
Fix up scripts (previous changes broke BDB2 testing)

Mainly updated back-bdb2, back-passwd, back-shell to use slap_get_time().

Building tests/progs/*.c in the main build process.
==> Test-suite must be called by 'make test', or 'make test-bdb2'

  correctness of locking schemas in backends.
In back-bdb2 open NEXTID during startup and close at shutdown.

Use $BACKEND instead of BDB2.  Fallback to LDBM if $BACKEND is not BDB2.

Integration into ./configure ( --enable-bdb2 ).
Adaptation of the test-suite ( 'make' -> ldbm; 'make bdb2-local' -> bdb2 ).
Minor fixes in slapd/libldbm.

John's still working on the 'perl-test' (the perl backend test module).

  make depend, make tests, and make install all work when build directory
  is not the $srcdir.
Also modified library handling such that -lpthread more likely to be last.
WARNING: new orderring requires use of LDFLAGS to set global loader options
  such as -L/usr/local/lib.  If you put this in LIBS, some libraries
  may not be found a link time.
Likely broke Kerberos/LDAPD support.  Don't have those in my testbed.

Now to sort out configure enable/with options.

Added NO_THREAD support to configure.in.  (Still need thread lib detection)