ready for 1alpha release

replace calls to dnNormalize2 with calls to dnNormalize

consolidated into the Operation structure. All reply parameters
are consolidated into the new SlapReply structure. Most operations
now have identical call signatures... Changes are not #ifdef'd,
revert to -r NO_SLAP_OP_BLOCKS if necessary to back out.

ITS#1677 - cast away const warnings
ITS#1678 - unsigned char args to ctype funcs
ITS#1682 - don't redefine ldap_debug
ITS#1683 - uninitialized vars
ITS#1703 - ldo_debug initialization
ITS#1705 - unsigned testing
ITS#1706 - socklen_t args
ITS#1719 - back-tcl update (other cleanups/fixes/improvements; yet untested)
ITS#1724 - integerNormalize/integerFilter/integerIndexer bugs
ITS#1725 - libdes not required

Implement back-null (/dev/null style backend)
Cleanup some misc warnings ("%lu" format, unused/uninitialized vars,
        ambiguous operator precedence)

Kurt, please regenerate configure

liblber:ber_bvarray_{add,free}.

Use typedefs for all backend functions, to minimize work in future API
updates. (back-*/external.h will never need updating in the future.)

   Changed AttributeDescription.{ad_cname,ad_lang} to struct berval everywhere
   Deleted ad_free() everywhere
   Added ad_mutex to init.c

The AttributeDescriptions are in a linked list hanging off of the
corresponding AttributeType.

Fix backend critical controls crash
Move 'associatedDomain' to core.schema

SASL mech removed from backend bind callback (as SASL is managed by frontend)
Changes to some backends are untested (as I don't have all dependent
  software install)

	add common request handler
	remove bind handler (not needed)