Add destructor callback to PROPFIND interface to guarantee cleanup of

memory allocated by the creator callback:

* src/ne_props.h (ne_propfind_set_private): Take destructor argument.

* src/ne_props.c (struct ne_propfind_handler_s): Add destructor field,
rename private_creator to creator and private_userdata to cd_userdata.
(start_response): Adjust for field renames.
(free_propset): Take handler argument; call destructor if necessary.
(end_response, ne_propfind_destroy): Pass handler to free_propset.
(ne_propfind_set_private): Adjust for field renames, store destructor.

* src/ne_locks.c (discover_results): Don't destroy lock here.
(ld_destroy): New function.
(ne_lock_discover): Register the destructor.

* test/lock.c: Mark fail_discover as no-longer-expected-to-leak.

* test/props.c (diffcmp): Improve diagnostics.
(pf_creator, pf_destructor): New functions.
(run_propfind): Renamed from run_simple_propfind; enhanced to run
non-simple PROPFIND requests too.
(propfind): Renamed from pfind_simple; call run_propfind; test 
invocation of creator/destructor callbacks too.


git-svn-id: http://svn.webdav.org/repos/projects/neon/trunk@960 61a7d7f5-40b7-0310-9c16-bb0ea8cb1845

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