better implementation for ITS#4996 and docs (ldapsearch(1) only; need to duplicate in other tools man pages)

handle returns in ldappasswd(1) and ldapwhoami(1).  Likely needs to be
added to other ldap*(1) commands.

Purports to remove kbind, but adds a ldap_search_s() request.

allow host resolution via DNS SRV based on the DN portion of the URI if no host is provided (ITS#4996)

  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.

Rename ManageDIT to Relax