tport: added tport_is_clear_to_send(), allow use of tport_pending() without msg
The error callback from tport can now be registered even if there is no request pending on transport (e.g., when keeping a transport connection open for inbound messages). darcs-hash:20070601191534-65a35-7b3e22bb692673dc70e1630d1e63313ed840dcdc.gz
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