[FIX] Electronic Agreement test with context
[IMP] RegForm: Add sorting criteria for checked in
[FIX] Typo masked by previous try..except

 * See previous commit
[FIX] Account for non-migrated fields
[FIX] List removal destroying parameters

 * Since flask introduction it's just doing harm
[FIX] Removed "seamless" attribute

It breaks the page in my Chrome version. It is not yet widely implemented, so I thought it would be better to remove it for now.
[FIX] Small typo
[FIX] Issue with lists of parameters

Caused failure in signature-based auth.
[FIX] Statistic method name
[REF] RegForm: mandatory event validation
[FIX] RegForm: Validation for section dialogs
[FIX] RegForm: SocialEvent Accompanying validation
[IMP] RegForm: validation enabled for ng-table
[IMP] RegForm: Section config dialog validate tab

Atomatic selection of the tab containing validation errors will only work from Angular 1.2 onwards
[FIX] RegForm: SocialEvent config frontend valid.
[MIN] RegForm: ndTable input number size

Size attribute hard-coded for browsers not implementing input
type=number
[FIX] RegForm: registrants in social events

Number of registrants selected in dropdown menu was shared among
all events listed
[IMP] Added 'registrant_payment_link' field

Registrant e-mails can now use it.
[FIX] Forgotten line
[FIX] Var referenced before assignment