Added new man page for ldap_parse_sort_control() API

doc/man/man3/ldap_parse_sort_control.3

+.TH LDAP_PARSE_SORT-CONTROL 3 "RELEASEDATE" "OpenLDAP LDVERSION"
+.\" $OpenLDAP$
+.\" Copyright 1998-2006 The OpenLDAP Foundation All Rights Reserved.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.SH NAME
+ldap_parse_sort_control \- Decodes the information returned from a search operation
+that used a server-side sort control.
+.SH LIBRARY
+OpenLDAP LDAP (libldap, -lldap)
+.SH SYNOPSIS
+.nf
+.ft B
+#include <ldap.h>
+.LP
+.ft B
+int ldap_parse_sort_control(ld, ctrls, returnCode, attribute)
+.ft
+LDAP *ld;
+LDAPControl **ctrls;
+unsigned long *returnCode;
+char **attribute;
+.SH DESCRIPTION
+This function is used to parse the results returned in a search operation
+that uses a server-side sort control.
+.LP
+It takes a null terminated array of LDAPControl structures usually obtained
+by a call to the 
+.BR ldap_parse_result
+function. A returncode which points to the sort control result code,and an array
+of LDAPControl structures that list the client controls to use with the search.
+The function also takes an out parameter \fIattribute\fP and if the sort operation
+fails, the server may return a string that indicates the first attribute in the
+sortKey list that caused the failure. If this parameter is NULL, no string is
+returned. If a string is returned, the memory should be freed by calling the
+ldap_memfree function.
+.SH NOTES
+.SH SEE ALSO
+.BR ldap_result (3),
+.BR ldap_controls_free (3)
+.SH ACKNOWLEDGEMENTS
+.B OpenLDAP
+is developed and maintained by The OpenLDAP Project (http://www.openldap.org/).
+.B OpenLDAP
+is derived from University of Michigan LDAP 3.3 Release.