preoperation plugin has removed all modifications and
thus there are none to pass to the backend.

Accept SSF as a valid parameter block value.

Fix completely broken slapi_access_allowed()

This API allows a plugin to associate arbitrary context with an
internal server object such as a connection or operation.

Some documentation is at:

http://enterprise.netscape.com/docs/directory/602/plugin/function.htm#1104211

Expose SSF to plugin

- conf file processing udpate
- misc updates

Split some too long preformatted lines.

Briefly compare back-bdb and back-ldbm.
Remove mention of MDBM and NDBM.  Rename GNU DBM to GDBM.
Fix spacing typos.  Prefix an octal file mode with 0.
Mention "notags" (new name for "nolang" from the attribute options patch).
Add SEE ALSO slapd-monitor(5) to slapd.conf(5).

- slimit, tlimit fix (ITS# 2592)

- slimit, tlimit fix (ITS# 2592)