Potential issue with building mhm via cmake
Both me and @extluedt have issues with building mhm with the makefile generated by cmake in the current develop-branch.
Getting the makefile with cmake seems to work fine as far as I can tell, but running 'make' on it fails
For both me and Stefan building the model via the Makefile (manual edits) from the master branch works just fine.
It seems when cloning from gitlab not all submodules have been properly included, causing missing files. This error is thus resolved.
This is using the the recommended the libraries as recommended in install.md
For completion's sake it should be noted that cmake works just fine using cygwin, generating the mhm executable.