entries. This allows us to use the frontend's entry directly instead
of having to entry_dup it before adding to the cache.

Add new entry_dup_bv that dups an entry in a single malloc. Leave it
unused for now; faster but consumes more heap.

checkpoints to the runq job

Currently enabled, preserving original order of input. See ifdefs to
alter the behavior: SLAP_MODS_CHECK_QUICKSORT, PRESERVE_ORDER

  use liblutil's ldif_read_record instead of read_one_record
  track line numbers across entire LDIF instead of just for a single
	entry, to allow easier locating of errors. (we can also add the
	-j jump option later.)
  split Add/Modify parse paths, precompute size of pmods instead of
  	continuously using realloc.

Entry processing is now linear time instead of n^2 with entry size.

add "report" to "onerr" modes: continue a search in case one target returns an error, and only propagate the error at the end