Reworking the client and server access method code

[minyard]

I've been digging around in the CVS server and client code to add an
ssl based server method, and I couldn't help notice what a mess it is.
I was curious if anyone was working on cleaning it up.  If not, I'd be
willing do clean it up and make the access methods more modular and
get rid of most of the ifdef and if statements.  I would also propose
pulling each access method into its own file and making buffer-based
I/O setup by the access method itself.

If the CVS maintainers are interested, I'll work on a patch for this.
If not, that's ok, I can live with it like it is, but I thought I'd
offer my services to do a cleanup.

-Corey