[A] Update for Gsp to Project XmlInterface rename.
Add ctest for ogs executable.
[A] Include copyright and version info.
[A] Make project file argument unlabeled.

This is not an optional argument and the extra flag is not necessary.
Specify arguments help info.
[D] Add Applications dir to doxygen inputs.
[A] Instatiate QApplication needed for XML interface.
Remove eol whitespaces; empty \file doc.
Break multiple statements in single line.
[A] Add EmptyProject BM.