Bonemeal flower fix

[planetguy]

Vanilla flower fix (Works 1.5, shouldn't break. Reuploaded with source code)

Several mods add many flowers of their own. However, more flower mods dilute the chance of vanilla flower spawns to almost nothing. Also, it deeply annoys me that dandelions are twice as common as roses, especially when I need roses. This mod adds a configurable amount of spawn weight to vanilla flowers. Roses are by default weighted 10, dandelions by default 20. Note: This mod can only increase spawn rates of vanilla flowers when bonemeal is used.