link or rename the binary to "ldapbench" and pass the number of requests
in $NUM in the environment.
Also, a slight optimization in ldapclient (it now calls shutdown when it
wrote the search request)
fix ldapclient to use all the arguments and cope with fused packets (one
read() returning the search result entry and the end marker).
Make ldif_parse() use strallocs (remove 8k limit on payloads)