Modify the algorithm computing the minimum of all TGraphs and take into account the case where the minimum is negative when an Unzoom happens on the y axis.
Modify the algorithm computing the minimum of all TGraphs and take into account
the case where the minimum is negative when an Unzoom happens on the y axis.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@3575 27541ba8-7e3a-0410-8455-c3a389f83636

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