From Bertrand: - Don't delete static pictures at TGListTree destruction time.   (to avoid problems when using several TGListTree)
From Bertrand:
- Don't delete static pictures at TGListTree destruction time.
  (to avoid problems when using several TGListTree)

P.S. from me: after these changes the four used pictures are never deleted


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@23033 27541ba8-7e3a-0410-8455-c3a389f83636

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