HTML doesn't have an </input> field.
Clear created domain from session.
Allow to add empty offpeak start/end time.
Filter sound groups according to config.
Prevent termination of contract with id 1.
Handle allowed_ips preference.

Write data to voip_allowed_ip_groups. Use voip_aig_sequence as counter.
Also move the Preference handling to Utils/Preferences.pm
Handle the preference man_allowed_ips like allowed_ips
Don't allow to terminate contract via list view.
Bump debian version to 1.0.13 for 3.0 release.