fix a bug for groups-slices synchronisation#64

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vemonet wants to merge 1 commit intoncbo:developfrom

agroportal:fix_group_slice_sync

Commits on Dec 8, 2016

fix a bug where slices were created by downcasing groups acronym. But when trying to retrieve them to update them, the groups acronym were not downcased so the slices were not found
vemonet
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