Removed horrible memleak from p3m_gpu.
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Changed p3m_gpu block-size issue.
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Reset influence function calculation to CPU mode.
Merge branch 'master' of ssh.icp.uni-stuttgart.de:/home/fweik/Source/espresso-clean
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Merge branch 'master' of https://github.com/espressomd/espresso
Added 'only_positive' feature to wall constraints.
Cleanup.
News.