Improve command argument control
Fix code formatting + replace boost range loop by C++11
Add model ID (via equivalentlink)
Fix opencog repo path with relative one
Simplify load_scm_file using guile load function

That way the variable current-filename is defined.
Typo in file-utils.scm top comment
Add relative-load-scm-from-file to load scm relative to one loading
Use relative-load-scm-from-file to load utilities.scm