(Re-)Integrate CLARIN Attribute Aggregator SP script
(Re-)configure https://github.com/ufal/clarin-sp-aaggregator/ to appear on https://lindat.mff.cuni.cz/services/aaggreg/
(Re-)configure https://github.com/ufal/clarin-sp-aaggregator/ to appear on https://lindat.mff.cuni.cz/services/aaggreg/