Added ldap_pvt_tls_get_strength() - return encryption strength, for
use as a SASL session security factor.

ITS#658: man page
 from Tom Jordan <tjordan@doit.wisc.edu>

input.  In input==NULL, returns FQDN of local host.
Fixed copy_hostent() uninitialized pointer bug.
Replaced gethostname calls with ldap_pvt_get_fqdn( NULL ) calls.

Update slapdcofig with additional directives
Add updated graphics and othe misc changes.

Need separate "Advanced Access Control" chapter as well (but leaving 'basic'
in slapdconfig.sdf.