- Classes for handling Controls

- extented Referral chasing (loop detection, hop limit, Rebind)
- support for Server Controls
- fixed many bugs and memory leaks

Copyright notices have been adjusted per on-file OpenLDAP Contributor
Assignment Agreement.

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.

(but mainly commiting because of the gserver switch)

trap code.

in searches, and experimental "trap" subcommand.

Update single debug/release not to use service manager nor event manager.
Likely breaks MINGW32 port.

Known bug: cache enabled is known to cause Tcl to abort upon exit.

* all others: Added DESTDIR support

create SECURITY_LIBS (top.mk) to order $SASL_LIBS $KRB_LIBS $TLS_LIBS
use $SECURITY_LIBS in Makefile.in's instead of $KRB_LIBS $TLS_LIBS

s/exit(0)/exit(EXIT_SUCCESS)/
add <ac/stdlib.h> where needed and other minor header adjustments

- Filter no longer a required controlArray member, defaults to objectclass=*.
- Sets errorCode with LDAP macro string value (better to test than the more
  human readable values).
- Shorten minimum required characters for search scope definitions: now allows
  "base", "one", and "sub".  For the latter two, additional characters are
  ignored.
- Now compiles successfully with -devel branch (though less tested).
- Client cache management code enabled for OpenLDAP versions <= 1.2.4.  (This
  code is relatively untested and feedback is welcome.)
- More installation cleanups to work easily as a dynamically loadable Tcl
  package.