Standardize include guards to use OPENVDS_ prefix
Standardize include guards to use OPENVDS_ prefix so they won't get mixed up with other projects (e.g. EXCEPTIONS_H was very generic and asking for trouble, which is now OPENVDS_EXCEPTIONS_H).
Starting on April 8th, The Open Group will require Two Factor Authentication for all GitLab users. For instructions on setting up 2FA, see the Knowledge Article or GitLab Documentation. Note in particular that any HTTPS clones will require the use of a Personal Access Token (rather than a user’s password) once 2FA is enabled.
Standardize include guards to use OPENVDS_ prefix so they won't get mixed up with other projects (e.g. EXCEPTIONS_H was very generic and asking for trouble, which is now OPENVDS_EXCEPTIONS_H).