Fix a segfault associated with output of rank?VarLen datasets
#511
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When the ouptut buffers must be extended, the `rank1VarLen` and `rank2VarLen` arrays must be extended and their original content copied back in. The was previously not done, resulting in a segfault due to out-of-bounds array access.
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When the output buffers must be extended, the
rank1VarLenandrank2VarLenarrays must be extended and their original content copied back in. The was previously not done, resulting in a segfault due to out-of-bounds array access.Thanks @msbovill for finding this problem!