GitLab

- the key must not be (single-)quoted otherwise this doesn't
  work with ZSH

- namespace prefix OTB_ added to most variables
- update to current versions
- exit with well defined codes on error
- compile Boost with -fPIC
- several configuration files added
- CMake script added which can be used to make the toolchain relocatable
- installation of profiles 'opal.sh' and 'otb_setup.sh'
- improved setup.sh

- with gcc-mp-9 and open-mpi
- with self-compiled gcc 9.2.0 and open-mpi