Improved DataExtractor class #1
Merged
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This commit solves a bug in the DataExtractor class and improves its performances for some corner cases.
Before this commit, the DataExtractor class failed if a variable had a dimension 1 on an axis with index i and if there was an axis with index j of dimension > 1 such that j < i. This should be fixed with this commit.
Moreover, it cleans a little bit the code making some statements more readable.
Finally, it also improves the performance of the classes when we read the first layer of a 3D variable (i.e., when we submit the argument dimvar=2). Before, it read all the variable and then it discarded all the layers different from 0. Now the routine reads only the required data.