[facturation/b2] Fix b2 type1 dest org, change how b2 files are created (fixes #5802).
[facturation/b2] Fix b2 type1 dest org, change how b2 files are created (fixes #5802).

    * The b2 type 1 destination organism is the real destination, not the
      policyholder health center destination organism.

    * b2() does not assert when the b2 file exists and has the regenerate switch
      to indicate if the file must be kept or regenerated. The swith can be set
      for the buildall() method. Then caling buildall will now recreate missing
      files by default.

ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide,ZTH1970/alcide