ra_svn/svnserve: remove support for v1 and non-edit-pipeline?

The svnserve protocol has two versions, v1 and v2. It also has a
variety of extra "capabilities", including "edit-pipeline".

v2 and edit-pipeline were introduced before Subversion 1.0.0 was
released. Our general compatibility guidelines do not require us to
continue to be compatible with pre-1.0 clients or servers.

Is there any reason not to drop support for v1 and non-edit-pipeline
clients and servers? That is, we would raise the minimum version
required by the server to 2, and make both client and server error out
if the other side is not advertising the edit-pipeline capability.

This would allow us to remove a large amount of duplicated dead code
(including some code that has always been dead, like the non-pipeline
implementation of ra_replay).

There are even checklists in various places in the code giving hints
as to what needs to be changed (see
libsvn_ra_svn/client.c(open_session), say).

--dave

-- 
David Glasser | glasser_at_mit.edu | http://www.davidglasser.net/
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