* NEWS: Document changes.
* doc/pound.8: Document changes.
* doc/poundctl.tmpl.5: Spell check
* src/config.c: Rewrite handling of URL, Header and Host directives.
* src/http.c (expand_url): Assume sm points to an array of two struct
submatch element. Treat $N as references to sm[SM_URL] and %N as
references to sm[SM_HDR].
* src/pound.c (thr_arg_destroy): Free both sm elements.
* src/pound.h (struct submatch): New field: subject.
(THR_ARG): Change type of sm.
* src/svc.c (submatch_reset): Reset subject to NULL.
(match_headers, match_cond): Rewrite submatch handling.
* tests/redirect.at: Add new tests.
* tests/url.at: Add new tests.
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