- Implement using pg_config for finding PostgreSQL files.

- Implement using pg_config for finding PostgreSQL files.
  Fixes bug #600. Patch supplied by user.
- Remove -t option from mktemp in mtx_changer.in and use
  working directory. Fixes bug #578.
- Update job start time after the any run before job so that
  files created by the script are only backed up once. Fixes
  bug #599.
- Strip trailing newline only from filenames entered in
  the restore command when reading a file. This permits
  the user to enter filenames with trailing spaces. Fixes
  bug #549. The user supplied a patch that I modified slightly.
- Use the most recent time (st_mtime, st_ctime) in the dir
  command in restore. This gives the user a better idea of what
  the newest file really is. This fixes bug #574. The fix
  was suggested by the user.
- Implement a compatible version of base64. This permits external
  programs to duplicate Bacula's base64 algorithm using standard
  routines. This fixes bugs #296, and 565. Patch submitted by
  author of bug #565.
  ================= Note ========================
  Previous Signatures stored in the database are no longer
  compatible with this. The main downside is for Verify jobs,
  and doing an InitCatalog run will fix the problem. Also, the
  authentication between the deamons is changed, so all daemons
  must be simultaneously upgraded.
  ==============================================
  If you don't like this fix, set:
    const bool compatible = true;
  to
    const bool compatible = false;
  in src/lib/base64.c