- Add Version, ConfigDir, and WorkingDir as Python attributes

- Add Version, ConfigDir, and WorkingDir as Python attributes
  in the Director.
- Implement code (principally for Win32) that on failure to
  create a file, it will cd into the directory and attempt
  to create the file using a relative path. This avoids creating
  files with paths which fail on Win32.
- Fix parsing of times and sizes with decimal numbers.
- Make free_volume_list() in SD work if vol list is not
  initialized (./bacula-sd -t).