update changelog and bump version number for 2.2.7-pre1
git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@719 3b7491f3-a168-0410-bf4b-c445ed680a29
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git-svn-id: https://svn.mcs.anl.gov/repos/darshan/trunk@719 3b7491f3-a168-0410-bf4b-c445ed680a29