Allow user to modify password

Closes #1682

See 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)

graph labels : one more test

See merge request !293

Fix compiler error (gcc4.8)

See merge request !310

There is a problem in g++4.8: erase with a const_iterator doesn't exist
(while it should: it is c++11).

Filtering and take into account close sequences

Closes #3225

See merge request !268

Provide a color by CDR3 method

See merge request !309

Feature s/more stats decorators

See merge request !306