[gcalctool] (5 commits) ...Update to 6.6.1

[Kalev Lember]

Summary of changes:

  ef637b7...  Update to 6.5.90.1 (*)
  cfe5587...  Update to 6.5.91 (*)
  b2c393c...  Update to 6.5.92 (*)
  bf1559f...  Update to 6.6.0 (*)
  2ab3d2e... Update to 6.6.1 (*)

(*) This commit already existed in another branch; no separate mail sent