- on account.asset.asset form view, field method_time, in 'Depreciation Information'
page: use radio widget instead (without it, you couldn't change the field)
- on account.asset.category form view: prorata field hidden when required, and set
to false when method_time is on 'Ending Date'. (It was previously possible for
the prorata to be true while the method_time was 'Ending Date', which is invalid)