add support for zip uncompression in file upload for non grouped files
PEP8 updates
use mobyle2.lib data objects
update FTP to use mobyle2.lib DataProject, ListData and StructData ot yet managed
update TODOs
fixes for tests + add new tests
add test for archive test
cosmetic updates
fix doc
Merge branch 'feature_data_uncompress' into develop
Merge branch 'develop' of https://github.com/mobyle2/mobyle2.datamanager into develop