Minor changes in the wrapper#7

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shapovalov wants to merge 7 commits intoamueller:masterfrom

shapovalov:master

Commits on Jan 23, 2013

1) generalized energy type in C++ wrapper
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Commits on Jan 24, 2013

Commits on Jan 31, 2013

Functions return energy value. Memory leak fixed.
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Commits on May 15, 2013

Commits on May 22, 2013

Merge pull request #1 from fgregg/master
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