sketchy patch for replacing adm_access in wc_diff_callback file_changed

Hi!

On request from hwright, I'm supplying my current work for replacing
adm_access batons in the file_changed callback of the
wc_diff_callbacks4_t struct.

I haven't looked at it thoroughly, just sending it over as a check if
there is any use in continue on this track.

I have removed the parts I have #if 0:ed concerning svn patch. Since
svnpatch is going to be changed I did not do any changes there.

When creating the adm_access baton in libsvn_wc/deprecated.c I have no
write_locks. That is probaly not the way to go. Since writing this a
couple of weeks ago I have gained some more knowledge about what the
locking is for.

If the wrapping is alright I'm having issues retrieving the adm_access
baton for the dir of the changed file in libsvn_client/merge.c
(merge_file_changed). The baton exists in repos_diff.c (close_file) *the
caller* but I can not retrieve it from the wc_ctx in the receiver.

/Daniel

PS: Sorry about the mime-type. Still having trouble with tigris and mutt.

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