Dqd utils

By Rob Mayoff.

• dqd_internalredirect - a wrapper around the C API function Ns_ConnRedirect. This lets you send back the contents of a different URL (from the same server) without letting the client know.
• dqd_md5 - computes MD5 hashes (cryptographic checksums).
• dqd_nssetToList - extracts an ns_set's values into a Tcl list.
• unlist - assigns the elements of a Tcl list to individual Tcl variables, efficiently. Yes, I left off the dqd_ prefix on this one.
• dqd_detachfile and dqd_attachfile - share a Tcl channel across requests/threads/interpreters.
• dqd_register_proxy - register a proc to handle proxy requests from browsers

http://dqd.com/~mayoff/aolserver/#dqd_utils