- P2C-02: tours record their origin (planned, GPX with file name, wanderer)
instead of reading it off their shape; the detail answers a provenance
contract and a trip copy keeps a tour's import record
- MF-03: a wanderer snapshot's source can be checked on purpose, read only,
with a confirmed reimport as a new snapshot
- PR1-18: every way of putting a tour on a day shares one set of rules
- PR1-07/08: each person can hide tours from the trip map; the list shows
each tour's line colour and the picked tour stands out on both maps