Modify ldapsearch(1) significantly. Now handles LDAPv3 search

Modify ldapsearch(1) significantly.  Now handles LDAPv3 search
references, extended results, and extended partial results.  LDIF
extended to support these new features and reported version 2.
-L now limits output to LDIFv1 for compatibility reasons.  No
-L is now LDIFv2.  Old alternative form is no longer supported.

Use LDAP_TMPDIR (in ldap_config.h) instead of hardcoded /tmp
Use LDAP_FILE_URI_PREFIX (in ldap_config.h) instead of hardcoded
	file://tmp/