adding missing persist()
Merge branch 'research' of https://github.com/matfed/CoAnSys into research
Merge branch 'research' of https://github.com/matfed/CoAnSys into research
Merge branch 'research' of https://github.com/matfed/CoAnSys into research
Merge branch 'research' of https://github.com/matfed/CoAnSys into research
Merge branch 'research' of https://github.com/matfed/CoAnSys into research