Also, took away abandon operations blank check against deferment.
Abandon must be deferred in some cases (such as when other operations
are pending) and should be deferred in some other cases (such as too
many threads).

ref are associated with the parent req instead of the original req, to
prevent infinite loops.

make file names more slapd-ish; add attribute inheritance to search attributes; precompile uppercased search

glueBack->be_entry_close before calling it

improve fix to ITS#2923; note that suffix massaging is inherently flawed, because comperisons should always occur on Normalized DN, while massaging can also occur on Pretty DN, but there is no guarantee they have the same length or any length-based comparison can work; so in any case, we should pass the Normalized DN and, if the Pretty DN is present, massage it as well accordingly