[reltool] Honour encoding in reltool_utils:prim_consult

This function is similar to file:consult, except it also operates on a
binary (e.g. read from an archive). The function now takes magic
encoding comment into account.
[reltool] Fix reconstruct source from debug_info to handle unicode

Also changing from using erl_syntax and erl_prettypr to using erl_pp
in order to get better handling of specs.
[reltool] Add unicode option to re:compile to allow unicode filenames
[reltool] Change ~s to ~ts and ~p to ~tp when appropriate
[reltool] Add unicode test
[reltool] Make escript test work with hipe and smp

reltool_server_SUITE:create_standalone and create_multiple_standalone
failed on test hosts running hipe and smp. The reason was that the
escript used in these tests explicitly disabled smp, which in turn
made the emulator spit out warnings like this:

"<HiPE (v 3.10)> Warning: not loading native code for module beam_lib:
it was compiled for an incompatible runtime system; please regenerate
native code for this runtime system"

This was returned from the escript and did not match the expected result.

To overcome this, the escript (reltool/examples/display_args) is
changed and does no longer disable smp.
[reltool] Improve stability of tests

* Make sure test node is terminated between each test
* Wait for expected applications to be started before continuing test
* Use ping instead of nodedown messages to check that node is down (to
  avoid failure due to no flush of inbox)
Update copyright years
Prepare release