GitLab

Set defaults for PLAT where needed

It is useful sometimes (e.g. in config.sh's pre_build') to do stuff based on
the current python version. The problem is that when running inside the docker
container the variable MB_PYTHON_VERSION is passed on only as PYTHON_VERSION
without the MB_ prefix, but in the macOS environment the latter is not
present. Thus, one needs to check both PYTHON_VERSION and MB_PYTHON_VERSION.
Better to pass both to the docker container, so one can jut check the value
of MB_PYTHON_VERSION on both mac and linux.

Note that the same hack is used in the 'install_run' function, where both
PYTHON_VERSION and MB_PYTHON_VERSION are passed through to docker run.

Nipy server's certificate is out of date, switch to using Rackspace
container instead.

* Add config.pre to override envvars used in `library_builders.sh`
Fixes part 2 of https://github.com/matthew-brett/multibuild/issues/116

* rename config_pre.sh to env_vars.sh as suggested

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

* Add config.pre to override envvars used in `library_builders.sh`
Fixes part 2 of https://github.com/matthew-brett/multibuild/issues/116

* rename config_pre.sh to env_vars.sh as suggested

* Allow to specify a custom $CONFIG_PATH

* need to also pass  to the docker container

Here, we pass both the USE_CCACHE variable and the CCACHE volume to docker.

Allow other build commands to Docker

BUILD_COMMIT not available directly from the repository, and may be useful for
later build steps.

Build / test Python versions conceptual separable in case of Linux
builds.

Make configuration more general.

Move responsibility for source futzing back to the travis.yml file,
because we are now doing only one build per job.