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fixes
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* serve_2.c:
(serve_build_run_dirs) multiple super-run directories support is improved.
* elem_ip_mask.c: copyright notice is updated;
(_xml_elem_ip_mask) function is removed.
* xml_utils.h: copyright notice is updated;
(_xml_elem_ip_mask) function is removed.

* convert-clars.c, convert-runs.c:
forced linking list is updated.
background job handling is improved.
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* super_run_packet.h:
(super_run_in_global_packet) 'rejudge_mode' flag is added.