relax SVN archive

svn+ssh://bugman@.../svn/relax/1.3

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r13706 | bugman | 2011-07-18 20:13:04 +0200 (Mon, 18 Jul 2011) | 6 lines

Fix for the PCS back-calculation function - divide by zero is now avoided.

The PCS back-calculation function was calculating the normalised bond vector between the lanthanide
atom and itself. The normalisation in this case is now avoided.
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