Moved BerElementBuffer to lber_pvt.h
	Defined union by macro so it can be easily reused.
Updated client/tools/common.c.

Needs to be applied to other stack allocated berbufs.

TODO:
	Fix transactional consistency
	Add client response control handling

directly re-uses existing ber buf.

set LBER_ELEMENT_SIZEOF to 256
maybe this should be set to N*sizeof(size_t) or something

allocating a copy.

rework them slightly to avoid computations which might result in underflow.
Rename them for consistency with other berval routines.
Remove some utf8 lint.

added ber_[mem|case]cmp() macros for fast berval comparison; extensively used in acl and in dn_match macro at present

liblber:ber_bvarray_{add,free}.

leftover ber_bvdup eliminated; rewritten ber_bvdup in terms of ber_dupbv; eliminated wrapper macro; other ber_* improvements

Clean up headers.

Compile with -DLDAP_CONNECTIONLESS to use this code.
For slapd, use "-h cldap://" to listen on UDP.
For ldapsearch, use "-H cldap://" to query on UDP.
Client-side support is very minimal:
  no automatic timeout/retries
  no basedn wildcard expansion on results
  no support for specifying multiple servers at once.