rename dnPretty2 to dnPretty

Improved ch_malloc/sl_malloc compatibility.

Needs work in normalizers, etc.

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.

Still chasing SLAP_NVALUES trashed filter bug

an unneccessary malloc.  (Actually, we should likely use local
filter structure to read things into and then malloc/copy once
we're sure there are no errors.)

so #ifdef for now.

but haven't yet figured out why NVALUES crashes in test003

improved filter mapping/rewrite; improved result rewriting; improved attribute/objectclass mapping configuration

	schema engine updated (but not schema routines so things don't run yet)
	nvalues mostly populated, enough for tests 0-2 to pass
	schema routines needs lots of work
	modify/mods codes needs lots of work

Use LDAP_SLISTs instead of per-struct list management for schema structs
misc cleanup and lint removal