Names are anonymized hence we only test the three first letter of the name

Fixes #3506

With clonedb#4 we can now launch grep clones just once with several sequences.

This prevents from accessing db.sample_set when we know we have access to the sample set.
May this be a problem if the sample set doesn't exist anymore?

This allows to speed up queries when we have many sample sets

Since 66a1edd4

This reverts merge request !196

As users will be able to modify their own password, we need to give a limit on the minimal password length

Fixes #1682

This is more flexible to add new errors.

We don't store specific rights for modifying user yet.
For now we can only modify our own account (or all accounts
if the person is admin)

collective work

See #3496

reorganise the meter bar so that we can have the value written in the
bad (saves a hover)

juste some more explicit logs so we can get a better picture of what is
happening straight from the logs