- Support #1220: CMake build is now also working with external models (checked extensively with AcousticWave). CMake build is not 100 % satisfactorily but it doesn the job. - Bug #1222: In v18.07 I introduced a bug along with #1221 that pevented the XCode project to work on a computer that is not mine (source files were in absolute paths). - Documentation #1223: A new section about how to install compilers on the three OS onto which MoReFEM has been tried has been added in README.md.