Fix test coverage setup

We do not add Cython line tracing and test coverage, because it
absolutely tanks performance to the level that the coverage job on
Travis will take well over two hours to complete (instead of 15-20
minutes).

.coveragerc

@@ -1,3 +1,10 @@
 [run]
-include = */qutip/*
-omit = */tests/*
+source = qutip
+omit =
+    # QuTiP test files
+    */qutip/tests/*
+
+[report]
+exclude_lines =
+    # Skip Python wrappers which help load in C extension modules.
+    __bootstrap__()

.travis.yml

@@ -6,12 +6,14 @@ _stage_generic_linux: &stage_generic_linux
   language: python
   # change dir
   before_script:
+    - QUTIP_DOWNLOAD=$(pwd -P)
     - mkdir qutip_testing
     - cd qutip_testing
   # command to run tests
   script:
     - python -m qutip.about
-    - pytest --verbosity=1 --disable-pytest-warnings --cov=qutip --pyargs qutip
+    - QUTIP_INSTALL=$(dirname $(python -c 'import qutip; print(qutip.__file__)'))
+    - pytest --verbosity=1 --cov=qutip --cov-config="${QUTIP_DOWNLOAD}/.coveragerc" --rootdir="${QUTIP_INSTALL}/qutip/tests" -c "${QUTIP_INSTALL}/qutip/tests/pytest.ini" --pyargs qutip
   install:
     - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
     - bash miniconda.sh -b -p $HOME/miniconda
@@ -111,7 +113,7 @@ _stage_linux_omp: &stage_linux_omp
     - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION
     - source activate test-environment
     - conda install mkl blas=*=mkl numpy 'scipy<1.5' pytest pytest-cov cython coveralls
-    - python setup.py install --with-openmp
+    - python setup.py install --with-openmp --line-trace
   after_success:
     - coveralls
 
@@ -122,12 +124,14 @@ _stage_osx_37: &stage_osx_37
   language: generic
   # change dir
   before_script:
+    - QUTIP_DOWNLOAD=$(pwd -P)
     - mkdir qutip_testing
     - cd qutip_testing
   # command to run tests
   script:
     - python -m qutip.about
-    - pytest --verbosity=1 --disable-pytest-warnings --cov=qutip --pyargs qutip
+    - QUTIP_INSTALL=$(dirname $(python -c 'import qutip; print(qutip.__file__)'))
+    - pytest --verbosity=1 --cov=qutip --cov-config="${QUTIP_DOWNLOAD}/.coveragerc" --rootdir="${QUTIP_INSTALL}/qutip/tests" -c "${QUTIP_INSTALL}/qutip/tests/pytest.ini" --pyargs qutip
   install:
     - wget https://repo.continuum.io/miniconda/Miniconda3-latest-MacOSX-x86_64.sh -O miniconda.sh
     - bash miniconda.sh -b -p $HOME/miniconda
@@ -148,12 +152,14 @@ _stage_osx_38: &stage_osx_38
   language: generic
   # change dir
   before_script:
+    - QUTIP_DOWNLOAD=$(pwd -P)
     - mkdir qutip_testing
     - cd qutip_testing
   # command to run tests
   script:
     - python -m qutip.about
-    - pytest --verbosity=1 --disable-pytest-warnings --cov=qutip --pyargs qutip -m "not slow"
+    - QUTIP_INSTALL=$(dirname $(python -c 'import qutip; print(qutip.__file__)'))
+    - pytest --verbosity=1 --cov=qutip --cov-config="${QUTIP_DOWNLOAD}/.coveragerc" --rootdir="${QUTIP_INSTALL}/qutip/tests" -c "${QUTIP_INSTALL}/qutip/tests/pytest.ini" --pyargs qutip
   install:
     - wget https://repo.continuum.io/miniconda/Miniconda3-latest-MacOSX-x86_64.sh -O miniconda.sh
     - bash miniconda.sh -b -p $HOME/miniconda