PROGRAM
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Pygmin

SUMMARY OF CHANGES
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- Added a SignError exception to DontLeaveBasin class if you try to
use a negative energy criterion.

- Added unit tests for the DontLeaveBasin class.

SUBROUTINES AFFECTED
--------------------

KEYWORDS AFFECTED
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KNOWN ISSUES
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Merge branch 'master' of https://github.com/js850/PyGMIN