* apt-pkg/acquire-worker.cc:

* apt-pkg/acquire-worker.cc:
  - show error details of failed methods
* apt-pkg/contrib/fileutl.cc:
  - if a process aborts with signal, show signal number
* methods/http.cc:
  - ignore SIGPIPE, we deal with EPIPE from write in
    HttpMethod::ServerDie() (LP: #385144)