[Plugin: Football Pool] Voorspelling

1. True, but negative scores (to be more precise: all invalid scores) are not accepted and converted to zeroes before they are saved in the database.

2. The user agent determines the behaviour of the number inputs. In Opera the first result is 0, in Chrome the first result is 1 and some other browsers just display a text input.

3. The plugin looks at the start time and date of a match. When a match has started (or a configurable amount of seconds before that time) a user cannot change the score. An admin that fills in the results before a match even started is not really a real life scenario.