Co-Authored-By: Maria de Vicente y Oliva
Co-Authored-By: Jaime Manera Bassa

NullPointerException was raised when this option is set, because
merged activities' tags were not set and therefore, they were null.

They were incorrectly interpreted as relative to the directory where
the workflow is stored.

Thanks to Vincent Dessarthe for the bug report.

Result#equals() is not implemented, hence the test consisting to check
whether the list of results available server-side contains() a given
result was a non-sense (the test always returned false).

I have no time to evaluate now if implementing Result#equals() would
have undesired side-effects, so I am conservative here and simply use
execution IDs to check whether our result is still present
server-side, or if it has been deleted.

When the client explicitly requests a summary of the available
results, this request should not be ignored, even if there is an error
server-side.  Some clients such as the CLI (SimpleCommandLine) expect
an answer, hence they may block endlessly if nothing is sent back.

v3.0.2, 2018/07/25

# gpg: Signature made Thu Jul 26 10:47:17 2018 CEST
# gpg:                using DSA key 4EF5AC48FB83D53EF6257543404D12D302F75873
# gpg: Good signature from "Sébastien Bigaret <sebastien.bigaret@telecom-bretagne.eu>" [ultimate]
# gpg:                 aka "Sébastien Bigaret <sebastien.bigaret@imt-atlantique.fr>" [ultimate]
# gpg:                 aka "Sébastien Bigaret <sebastien.bigaret@enst-bretagne.fr>" [ultimate]
# Primary key fingerprint: 1B82 8711 3D78 EA08 A17B  ECF8 28D9 87F2 4ECD BCE1
#      Subkey fingerprint: 4EF5 AC48 FB83 D53E F625  7543 404D 12D3 02F7 5873

We want to use it to indicate that the JVM version is incorrect e.g.
So the less class are loaded, the best it is.

Configuration.resetLocale() is a now no-op if called with null.
As a result, it relies on the default common.I18N mechanism: use the
default locale if possible, or fall back to English.