Added tag NUTAG_ALLOW_EVENTS().

Modified sofia-sip/nua_tag.h, nua_params.h, nua_params.c, test_nua_params.c.

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darcs-hash:20061012121449-1b897-c250f0241cd9984668a4a403dc72c66fcffbd5dd.gz

tl_gets(), tl_tgets(): reverted back using int as return type. Ditto for soa_get_params()/soa_set_params().

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Changes in iptsec/auth_common.c, test_nua_params.c, nua/test_register.c,
nua/test_sip_events.c, sres.c, win32/unistd.h.

darcs-hash:20060920172942-65a35-4c3dace501734da7cb6932981461ff49b68337d1.gz

These tags are used to modify the Contact header generated by the stack in
the nua_handle_contact_by_via() header. Currently, the tags only affect
Contact header generated for registration.

Updated internal outbound interface in order to make use of the new features.

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nua_subnotref.c, nua_notifier.c, sofia-sip/nua_tag.h, nua_tag.c, nua_params.c, nua_params.h: first refer event may or may not have id parameter. Added parameter nutag_refer_with_id for changing the behaviour (in case something breaks down if id *is* included with first subscription).

test_params.c: added tests for setting and getting NUTAG_REFER_WITH_ID().

test_refer.c: testing Event: refer with and without id.

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Added files test_nua.h test_nua_api.c test_nua_params.c test_register.c
test_basic_call.c test_call_reject.c test_cancel_bye.c test_call_hold.c
test_session_timer.c test_refer.c test_100rel.c test_simple.c
test_sip_events.c.

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