Ev2 shims: Some scaffolding to support the handling of text deltas.  This doesn't have any effect yet.
Ev2 shims: Some scaffolding to support the handling of text deltas.  This
doesn't have any effect yet.

* subversion/libsvn_delta/compat.c
  (ev2_file_baton): Add delta_base member.
  (action_code_t): Add ACTION_SET_TEXT.
  (process_actions): Handle the above action by opening the contents file,
    also, set the contents for non-added nodes.
  (ev2_add_file): Set the delta base as NULL.
  (ev2_open_file): Same.
  (ev2_apply_textdelta): Set up the source and target streams, but don't do
    anything about actually using them.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion