[PATCH] Converter for svn_wc_status3_t to svn_wc_status2_t

Hi!

Since I can't test it, and know too little of libsvn_wc, I ask if
any of you guys think it looks ok?

[[[
Implmenent converter function for converting svn_wc_status3_t to
svn_wc_status2_t.

* subversion/include/private/svn_wc_private.h
  (svn_wc__status2_from_3): Return svn_error_t * instead of
    svn_wc_status2_t *. Return the new status in an out parameter
    instead. I needed to be able to return errors from the entry
    fetching function. Add wc_ctx and local_abspath parameters to be
    used when fetching the entry.

* subversion/libsvn_wc/deprecated.c
  (status_4_wrapper_baton): Add wc_ctx field to be used when calling
    svn_wc__status2_from_3().
  (status4_wrapper_func): Track parameter and return value changes of
    svn_wc__status2_from_3().
  (svn_wc_get_status_editor4): Initialize wc_ctx field of the
    wrapper_baton.
  (svn_wc_status2): Track parameter and return value changes of
    svn_wc__status2_from_3().

* subversion/libsvn_wc/util.c
  (svn_wc__status2_from_3): Initialize the svn_wc_status2_t struct with
    values from svn_wc_status3_t.

* subversion/libsvn_client/deprecated.c
  (status4_wrapper_baton): Add ctx field.
  (status4_wrapper_func): Track parameter and return value changes of
    svn_wc__status2_from_3().
  (svn_client_status4): Initialize ctx field of wrapper_baton.
]]]