Fix ldaphost == NULL bug

Add addresses optimization to rfc822-ext too.

the presence of a certain value in some other attribute.  Used to
implement mailForwardingAddress both in addition to normal delivery
and excluding normal delivery, selectable entry by entry.  The model
is mailDeliveryOption in Netscape MS.  The implementation aims to
become more general, though.  Affects "search-with-filter", any
entry can potentially use a parameter, introduced with "param=".

Optimize the case where we have to copy the message to an address that
is served by the directory.  Formerly, we would have the MTA deal with
it and invoke mail500 again later.  This has necessitated loading the
list of domains that are solved by us with "domain".  A new definition,
"host", takes the role of the old "domain" that was the FQDN of our
host for routing loop avoidance.

part into something to check against the cn of entries.  It is
supported again thorugh the selector %s in the search.
Explicitly initialize some pointers in automatic storage.

anyway.  A new syntax is defined, "present", that indicates that
values of an attribute type are not used, only presence is
significant.  To do routing at the MTA, define both mailHost and
mailRoutingAddress with syntax "present".  Otherwise, use "host" and
"rfc822" and mail500 will try to do routing by itself, if possible.
Read the comments in the code for the ugly details.
Added a new configuration line "own-address" that describes the FQDN of
our host to compare with mailHost.  The line can be repeated.

caused incorrect data in result array and possibly segmentation
violations when searches terminated due to errors such as timeout,
exceeding search limit, or the remote server going down in the middle
of a search.  Also correctly puts error message on top of
traceback stack (instead of randomly in memory per the stale result obj).

A segmentation violation could have manifested later in the program's
life, or perhaps during termination of the interpreter.

avoid trying to free it again.

itself in that cn suddenly becomes case-sensitive.

nested groups or the laser mail routing draft.  Mostly, this is
because a flag saying the attribute type is 'final' is not flexible
enough.  The old 'final' flag is gone and replaced by a priority
level.

Change 'forward' to 'route' to be consistent with the laser wording.

Add new 'domain' spec in the configuration file to describe what are
the local domains so that we do not loop when doing the laser thing.

We were escaping asterisks in filters.  This seems incorrect.  Removed.

applied to RE 1.2.

without -DSLAPD_SQL

override ldbm.h setting.

values after delete of any value.

Fix provided by pturgyan@umich.edu