relax SVN archive

svn+ssh://tlinnet@.../svn/relax/trunk

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r27167 | bugman | 2015-01-14 17:00:51 +0100 (Wed, 14 Jan 2015) | 10 lines

Fix for bug #23187 (https://gna.org/bugs/?23187).

This is the problem whereby opening the spin viewer window, deleting a residue, and then reopening
the spin viewer crashes relax.

This change completes the spin viewer update_*() functions. The prune_list variable was initialised
but not used. Now it is used to store the keys of the items to delete, and then the items are
deleted at the end in a new loop so that the loop over the dictionary keys is not corrupted.
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