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updated the doc of the params that receive the statistics_generator hook
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Added a example feature for node statistics is pending to implement the custom filters hook
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Added the (no results found) message when there are no results at filter, fixed a bug in compare view that doesn't taked into account that when a one sidebar chart doesn't have data then doesn't make sense to print the twin chart to compare, added some template themes to make easy the theming
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implemented compare statistics functionality that provide a new form filter with two criterias in each group of statistics to make comparations of the results that match distinct criterias. Refactorized some functions and extracted the implementation of hook_statistics_generator_filters to example module
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Initial commit statistics generator module.