allow for non-parallel related configuration items in conffile
Modify preprocessor/ConfigFile.cc to accept non-parallel-related configuration commands. Add a new section, e.g. [hooks] with, for the moment only one, option: global_initialization. i.e., something like:
[hooks] global_initialization_file = path/to/file.m
Write /path/to/file.m to var in modfile.m then execute it at the end of global_initialization.m if the var is not empty.
Then, revert change 41def7ca