How to keep settings between snapshot updates

[sihui]

If you have updated from a build previous to #624, the reason is:

Replacement of mapdb by jsondb

All, I feel sorry to tell you that the distro build #624 brings another breaking change, but as in the past, I am certain that it is for the better! There has been a long discussion around the problem that the Things that are created through the Paper UI are stored in a binary database (the mapdb, data to be found under userdata/mapdb), which is not readable or manually editable (e.g. for fixing or cleaning). @chris came up with a nice new implementation of a storage service (luckily, ESH is …

Updates from #624 or up to newer builds should not delete things or any other config (at least not on my system).