- Add files posexcept.{hh,cc} that contains exception classes.
- Add class Input, that handles InputMedium (and InputLogMedium, in the
future). Note that for the moment, the unit test is *very* minimal.
- UserInterface: Add options for the input medium and the CSV file.
- Add class Configuration, a stock for the configuration structure.
- Add class UserInterface, that handles the configuration input.
- Update owlps-positioning.cc (delete old stuff like configuration) and
delete owlps-positioning.hh: we now have a compilable executable.