Adding a comment with the info of each property
Adding the idea of father_structure to all structures (actually, it's just a tree of structures) adding also the functionality of local and global names
I've realized that the struct openDDL_name is no more needed
Fixing get_reference and get_type to work without strings. STRINGS ARE SLOW!
Removing references as a concept. References are just a way to call names. So a reference is automatically linked to a name. If the name does not exist. just create a NULL name