24.03.2002 11:33
- removed the shm code from localizer_init and localizer_read as it caused
  more problems than necessary.
- added localizer_init_read() which is now responsible for the SHM handling
- added better error-handling for the SHM stuff

12.03.2002 17:21
- added checks for the shm-sement
  - a localizer segment ?
  - calculated size == effective size ?
