fix test_plain

tests/test_plain.py

@@ -65,6 +65,7 @@ if __name__ == '__main__':
     opt = parser.parse_args(
             ['-n', '32',
              '--run',
+             '--initialize',
              '--ncpu', '2',
              '--nparticles', '1000',
              '--niter_todo', '48',

tox_plain.ini

-[tox]
-envlist = py34
-[testenv]
-sitepackages = True
-whitelist_externals =
-    echo
-    cp
-    g++
-passenv = LD_LIBRARY_PATH
-changedir =
-    {envtmpdir}
-commands =
-    cp -r {toxinidir}/tests {envtmpdir}
-    #python tests/test_plain.py -n 256 --run --initialize --ncpu 8 --niter_todo 8 --precision single --wd "data/single"
-    #python tests/test_plain.py \
-    #    -n 128 --run --initialize --ncpu 2 \
-    #    --nparticles 100 --niter_todo 24 \
-    #    --precision single --wd "data/single" #\
-    #    #--multiplejob
-    python tests/test_plain.py -n 32 \
-        --run --initialize --multiplejob \
-        --ncpu 2 --nparticles 16 \
-        --niter_todo 48 \
-        --precision single --wd "data/single"
-    python tests/test_plain.py -n 32 \
-        --run --initialize --multiplejob \
-        --ncpu 2 --nparticles 16 \
-        --niter_todo 48 \
-        --precision double --wd "data/double"
-