[ci] restrict ninja to 1 proc again since we are exhausting vmem

.travis.after_script.bash

 #!/bin/bash
-#
-# This file is part of the dune-xt-la project:
-#   https://github.com/dune-community/dune-xt-la
-# Copyright 2009-2018 dune-xt-la developers and contributors. All rights reserved.
-# License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
-# Authors:
-#   Felix Schindler (2017)
-#   Rene Milk       (2017 - 2018)
 
 # ****** THIS FILE IS AUTOGENERATED, DO NOT EDIT **********
 # this file is treated as a jinja2 template
 
-${DUNE_VENV_ACTIVATE}
-
 WAIT="${SUPERDIR}/scripts/bash/travis_wait_new.bash 45"
 source ${SUPERDIR}/scripts/bash/retry_command.bash
 

.travis.make_env_file.py

 #!/usr/bin/env python3
-#
-# This file is part of the dune-xt-la project:
-#   https://github.com/dune-community/dune-xt-la
-# Copyright 2009-2018 dune-xt-la developers and contributors. All rights reserved.
-# License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
-# Authors:
-#   Rene Milk (2017 - 2018)
 
 import os
 from os.path import expanduser

.travis.script.bash

 #!/bin/bash
-#
-# This file is part of the dune-xt-la project:
-#   https://github.com/dune-community/dune-xt-la
-# Copyright 2009-2018 dune-xt-la developers and contributors. All rights reserved.
-# License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
-# Authors:
-#   Felix Schindler (2017)
-#   Rene Milk       (2017 - 2018)
 
 # ****** THIS FILE IS AUTOGENERATED, DO NOT EDIT **********
 # this file is treated as a jinja2 template
@@ -14,17 +6,15 @@
 set -e
 set -x
 
-${DUNE_VENV_ACTIVATE}
-
 WAIT="${SUPERDIR}/scripts/bash/travis_wait_new.bash 45"
 source ${SUPERDIR}/scripts/bash/retry_command.bash
 
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} configure
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD}
 if [ x"${TESTS}" == x ] ; then
-    ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v test_binaries
+    ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -j1 -v test_binaries
 else
-    ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v test_binaries_builder_${TESTS}
+    ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -j1 -v test_binaries_builder_${TESTS}
 fi
 
 source ${OPTS}
@@ -32,8 +22,9 @@ CTEST="ctest -V --timeout ${DXT_TEST_TIMEOUT:-300} -j ${DXT_TEST_PROCS:-2}"
 
 if [ x"${TESTS}" == x ] ; then
     ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${CTEST}
-    ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${BUILD_CMD} headercheck
+    ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -j1 headercheck
 else
+    # with binning headercheck is included in building tests
     ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ${CTEST} -L "^builder_${TESTS}$"
 fi
 

.travis.yml

 # This file is part of the dune-xt-la project:
 #   https://github.com/dune-community/dune-xt-la
-# Copyright 2009-2018 dune-xt-la developers and contributors. All rights reserved.
+# Copyright 2009-2017 dune-xt-functions developers and contributors. All rights reserved.
 # License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
+#      or  GPL-2.0+ (http://opensource.org/licenses/gpl-license)
+#          with "runtime exception" (http://www.dune-project.org/license.html)
 # Authors:
 #   Felix Schindler (2016 - 2017)
-#   Rene Milk       (2016 - 2018)
+#   Rene Milk       (2016 - 2017)
 #   Tobias Leibner  (2016)
-#
-#      or  GPL-2.0+ (http://opensource.org/licenses/gpl-license)
-#          with "runtime exception" (http://www.dune-project.org/license.html)
 
 sudo: required
 dist: trusty