This fixes#607 and add a test case for this bug.
It also renames participants in test cases to avoid alphabetical ordering.
Inserting participants in alphabetical order is a special case, because ordering by ID will be the same as ordering by name. This is a bad idea in test cases, as #607 has shown.
* Align tables in statistics
The table in sidebar is now aligned with the one in content, to avoid
redundant informations.
All tables are back to normal on small devices.
* fix test
* run black on tests
Clearer data structure, and simpler template
This commit has a side effect: sidebar now hides disabled members.
IMHO, the disabled members should either be hidden or shown consistently between
sidebar and central table. Previous status was: shown in sidebar (if balance ≠
0) and hidden in central table.
