In the master branch, the encoding for most xml files have been
changed from latin-1 to utf-8. The problem is, that the corresponding
files in the maint branch still are encoded in latin-1, and that
a merge from maint to master may bring in characters encoded in latin-1
into a notes.xml file declared to be in utf-8.

To fix the problem once and for all (for the files involved), we'll
need to re-encode the files files utf-8 in maint, and then merge to
master.

Noticed-by: Magnus Henoch

Using the low-level BEAM instructions, we can loop over each message in
the process queue and removes the first message that matches, without
receiving them all to later send them back to itself.

The function prim_eval:'receive'/2 is equivalent to the
following pseudo-code:

  'receive'(F, T) ->
    RESET MESSAGE QUEUE POINTER,
    LOOP:
      case PEEK CURRENT MESSAGE WITH TIMEOUT T of
        {ok,Msg} ->
          case F(Msg) of
            nomatch ->
              DECREMENT TIMEOUT T,
              ADVANCE MESSAGE QUEUE POINTER,
              GOTO LOOP;
            Result ->
              RESET MESSAGE QUEUE POINTER,
              Result
          end;
        timeout ->
          RESET MESSAGE QUEUE POINTER,
          timeout
      end.

To not break Dialyzer and other tools, we use a stub Erlang module which
abstract code is forcefully inserted into prim_inet.erl afterwards
compilation.

Test nodes are started with erlang:open_port/2, using the -detached
option to erl. -detached causes the port returned from open_port/2 to
be closed automatically. Some test cases failed occasionally with a
badarg when attempting to close the port with erlang:port_close/1. To
avoid this the call to port_close/1 is now removed.

* siri/cuddle-with-tests:
  [reltool] Clean up work dir after test
  [observer] Add debug printouts in ttb_SUITE

This is to save space in daily tests.
Result of failed test cases are still saved.