Rationalise Springie rights system
There are now several definite tiers of Springie rights:
1: normal user
2: trusted user
3: superuser
4: admin
0: untrusted/punished user
Bosses are set to level 3 if it is higher than their normal level.
Rights 1 people are automatically promoted to rights 2 upon reaching level 20.
Several votes such as kick, force, split and exit require level 2 to start.
Currently, no commands require level 4 or higher.
User rights changes now say who did them