Merge pull request #78 from 4teamwork/merge_friendly_time_data_converter

I like it!
Merge pull request #80 from 4teamwork/merge_fix_reserve_separately

Thanks. Next time it would be nice if the new javascript would be loaded without having to do a hard refresh. I believe recooking the jsregistry in an upgrade step has that effect.
Merge pull request #81 from 4teamwork/add_session_id_test

Add test for the generate_session_id function.
Don't autohide messages but replace old ones.
Update history.