The documentation lists 'keep', 'strip' and 'all' as valid values, but
only 'keep' is allowed. The others give you an exit with "Illegal
option: {app_file,all}".
The following line in reltool_server.erl needs Val to be both 'strip'
and 'all' simultaneously:
app_file when Val =:= keep; Val =:= strip, Val =:= all ->
In 0.5.3 (R13B04) and the dev branch.