- Remove the -f option from the chown in Makefile.in for more

- Remove the -f option from the chown in Makefile.in for more
  portability.
- Change setting the group in Makefile.in to use chgrp for
  more portability.
- Implement a write_store and read_store to replace
  dirstore in reserve.c
- Implement a Bacula read/write lock for Python rather
  than using the Python lock to avoid recursive problems.
- Correct the uninstall directory names in filed/Makefile.in
  as reported by a user.